Decision tables: Difference between revisions
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{{draft task}}
{{Wikipedia|Decision Table|en}}<br>
[[wp:Decision_table|Decision Tables]] are a precise yet compact way to model complicated logic.
Line 7 ⟶ 9:
Demonstrate how your language implements decision tables.
Use
<br><br>
=={{header|11l}}==
{{trans|Kotlin}}
<syntaxhighlight lang="11l">V conditions = [
(‘Printer prints’ , ‘NNNNYYYY’),
(‘A red light is flashing’ , ‘YYNNYYNN’),
(‘Printer is recognized by computer’, ‘NYNYNYNY’)]
V actions = [
(‘Check the power cable’ , ‘NNYNNNNN’),
(‘Check the printer-computer cable’ , ‘YNYNNNNN’),
(‘Ensure printer software is installed’, ‘YNYNYNYN’),
(‘Check/replace ink’ , ‘YYNNNYNN’),
(‘Check for paper jam’ , ‘NYNYNNNN’)]
V nr = conditions[0][1].len
V np = 7
print(‘Please answer the following questions with a y or n:’)
[Bool] answers
L(condition) conditions
V inp = ‘’
L
inp = input(‘ ’condition[0]‘ ? ’).uppercase()
I inp C (‘Y’, ‘N’)
L.break
answers.append(inp == ‘Y’)
print("\nRecommended action(s):")
L(r) 0 .< nr
L(c) 0 .< conditions.len
V yn = I answers[c] {‘Y’} E ‘N’
I conditions[c][1][r] != yn
L.break
L.was_no_break
I r == np
print(‘ None (no problem detected)’)
E
L(action) actions
I action[1][r] == ‘Y’
print(‘ ’action[0])
L.break</syntaxhighlight>
{{out}}
<pre>
Please answer the following questions with a y or n:
Printer prints ? n
A red light is flashing ? n
Printer is recognized by computer ? n
Recommended action(s):
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
</pre>
=={{header|Ada}}==
First the specification of a generic decision table package:
<
type Condition is (<>);
type Action is (<>);
Line 32 ⟶ 89:
end Generic_Decision_Table;
</syntaxhighlight>
Next, the implementation of the generic decision table package:
<
procedure React(Rules: Rule_A) is
A: Answers;
Line 54 ⟶ 111:
end Generic_Decision_Table;
</syntaxhighlight>
That was easy! Now we implement the printer troubleshooting application:
<
procedure Printer_Decision_Table is
Line 123 ⟶ 180:
begin
DT.React(R);
end Printer_Decision_Table;</
Sample output:
<pre>> ./printer_decision_table
Line 154 ⟶ 211:
=={{header|AutoHotkey}}==
<
(
Printer does not print |Y|Y|Y|Y|N|N|N|N|
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Res .= Act%A_Index% "`n"
GuiControl,, Output, % Res
return</
=={{header|AWK}}==
<syntaxhighlight lang="awk">
# syntax: GAWK -f DECISION_TABLES.AWK DECISION_TABLES.TXT
BEGIN {
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return
}
</syntaxhighlight>
<p>decision table:</p>
<pre>
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=={{header|C}}==
With flaky keyboard input:<
#define N_COND 3
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}
return 0;
}</
A red light is flashing? n
Printer is unrecognised? y
Line 390 ⟶ 448:
Check the power cable
Check the printer-computer cable
Ensure printer software is installed</
=={{header|C++}}==
{{trans|Java}}
<syntaxhighlight lang="cpp">#include <iostream>
#include <string>
#include <vector>
const std::vector<std::pair<std::string, std::string>> conditions = {
{"Printer prints", "NNNNYYYY"},
{"A red light is flashing", "YYNNYYNN"},
{"Printer is recognized by computer", "NYNYNYNY"}
};
const std::vector<std::pair<std::string, std::string>> actions = {
{"Check the power cable", "NNYNNNNN"},
{"Check the printer-computer cable", "YNYNNNNN"},
{"Ensure printer software is installed", "YNYNYNYN"},
{"Check/replace ink", "YYNNNYNN"},
{"Check for paper jam", "NYNYNNNN"},
};
int main() {
const size_t nc = conditions.size();
const size_t na = actions.size();
const size_t nr = conditions[0].second.size();
const int np = 7;
auto answers = new bool[nc];
std::string input;
std::cout << "Please answer the following questions with a y or n:\n";
for (size_t c = 0; c < nc; c++) {
char ans;
do {
std::cout << conditions[c].first << "? ";
std::getline(std::cin, input);
ans = std::toupper(input[0]);
} while (ans != 'Y' && ans != 'N');
answers[c] = ans == 'Y';
}
std::cout << "Recommended action(s)\n";
for (size_t r = 0; r < nr; r++) {
for (size_t c = 0; c < nc; c++) {
char yn = answers[c] ? 'Y' : 'N';
if (conditions[c].second[r] != yn) {
goto outer;
}
}
if (r == np) {
std::cout << " None (no problem detected)\n";
} else {
for (auto action : actions) {
if (action.second[r] == 'Y') {
std::cout << " " << action.first << '\n';
}
}
}
break;
outer: {}
}
delete[] answers;
return 0;
}</syntaxhighlight>
{{out}}
<pre>Please answer the following questions with a y or n:
Printer prints? n
A red light is flashing? n
Printer is recognized by computer? n
Recommended action(s)
Check the power cable
Check the printer-computer cable
Ensure printer software is installed</pre>
=={{header|COBOL}}==
<
identification division.
program-id. 'decisiontable'.
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end program 'decisiontable'.
</syntaxhighlight>
{{out}}
Line 500 ⟶ 634:
=={{header|D}}==
<
immutable struct DecisionTable {
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d.consult;
}</
{{out}}
<pre>Printer is unrecognised? [y=yes/others=no] no
Line 592 ⟶ 726:
===Alternative Version===
{{trans|C}}
<
struct DataPair(size_t N) {
Line 632 ⟶ 766:
writeln(" ", sol.message);
}
}</
{{out}}
<pre>Printer does not print? [y=yes/others=no] no
Line 639 ⟶ 773:
So, you don't have a problem then?</pre>
Keyboard handling is sketchy, just type "true" or "false" to each question.
=={{header|FreeBASIC}}==
<syntaxhighlight lang="freebasic">dim as boolean rules(0 to 2, 0 to 7) =_
{ {false, false, false, false, true, true, true, true},_
{ true, true, false, false, true, true, false, false},_
{false, true, false, true, false, true, false, true} }
dim as boolean actions(0 to 4, 0 to 7) =_
{ {false, false, true, false, false, false, false, false},_
{ true, false, true, false, false, false, false, false},_
{ true, false, true, false, true, false, true, false},_
{ true, true, false, false, false, true, false, false},_
{false, true, false, true, false, false, false, false} }
dim as string rule_names(0 to 2) =_
{"Printer prints", "A red light is flashing",_
"Printer is recognized by computer"}
dim as string action_names(0 to 4) = _
{"Check the power cable", "Check the printer-computer cable",_
"Ensure printer software is installed", "Check/replace ink",_
"Check for paper jam" }
dim as boolean answers(0 to 2)
for i as uinteger = 0 to 2
print rule_names(i),
input answers(i)
next i
print "---- Suggested solutions: ----"
for i as uinteger = 0 to 4
for j as uinteger = 0 to 7
if not actions(i, j) then continue for
for k as uinteger = 0 to 2
if rules(k, j)<>answers(j) then goto dontdoit
next k
print action_names(i)
dontdoit:
next j
next i</syntaxhighlight>
=={{header|Go}}==
Go has no specific support for decision tables, but they can be implemented easily. With a little ingenuity, literal data can be arranged in rows and columns in a way that preserves the visual associations of decision tables. Go has an init function that might be useful for compiling decision tables at program startup. And Go maps allow efficient lookup of actions given conditions.
<
import (
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fmt.Println(a)
}
}</
Output:
<pre>
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=={{header|Icon}} and {{header|Unicon}}==
<
record act(text,flags,aflags)
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}
}
end</
Sample Output:<pre>Printer does not print ? Y
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=={{header|J}}==
'''Solution''':<
'RULE_NAMES RULES'=: |:':'&cut;._2 noun define
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options=. a #~ y {~ #. 'Y'={.@toupper@deb@(1!:1)@1:@smoutput@,&'?'@dtb"1 q
(,~ ('/'cut'Suggested resolutions:/Solution unknown.') {::~ 0=#) options
)</
'''Example''' (''solution found''):<
Having trouble? Let's track down the problem:
Printer does not print?
Line 831 ⟶ 1,009:
Check the printer-computer cable
Ensure printer software is installed
Check/replace ink </
'''Example''' (''solution not found''):<
Having trouble? Let's track down the problem:
Printer does not print?
Line 841 ⟶ 1,019:
N
Solution unknown.
</syntaxhighlight>
=== Comments ===
Line 848 ⟶ 1,026:
For large numbers of rules and few actions, J's native support of sparse arrays might provide a performance advantage, particularly in space. A minor note about the implementation here: the verb (function) <tt>troubleshoot</tt> is generalized, and reusable on any set of rule table, questions, and suggested actions. The default is to use those given in the printer troubleshooting table.
=={{header|Java}}==
{{trans|Kotlin}}
<syntaxhighlight lang="java">import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Objects;
public class DecisionTables {
private static class Pair<T, U> {
private final T t;
private final U u;
public static <T, U> Pair<T, U> of(T t, U u) {
return new Pair<>(t, u);
}
public Pair(T t, U u) {
this.t = t;
this.u = u;
}
public T getFirst() {
return t;
}
public U getSecond() {
return u;
}
}
private static final List<Pair<String, String>> conditions = List.of(
Pair.of("Printer prints", "NNNNYYYY"),
Pair.of("A red light is flashing", "YYNNYYNN"),
Pair.of("Printer is recognized by computer", "NYNYNYNY")
);
private static final List<Pair<String, String>> actions = List.of(
Pair.of("Check the power cable", "NNYNNNNN"),
Pair.of("Check the printer-computer cable", "YNYNNNNN"),
Pair.of("Ensure printer software is installed", "YNYNYNYN"),
Pair.of("Check/replace ink", "YYNNNYNN"),
Pair.of("Check for paper jam", "NYNYNNNN")
);
public static void main(String[] args) throws IOException {
final int nc = conditions.size();
final int na = actions.size();
final int nr = conditions.get(0).getSecond().length();
final int np = 7;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Please answer the following questions with a y or n:");
final boolean[] answers = new boolean[nc];
for (int c = 0; c < nc; ++c) {
String input;
do {
System.out.printf(" %s ? ", conditions.get(c).getFirst());
input = br.readLine().toUpperCase();
} while (!Objects.equals(input, "Y") && !Objects.equals(input, "N"));
answers[c] = Objects.equals(input, "Y");
}
System.out.println("\nRecommended action(s)");
outer:
for (int r = 0; r < nr; ++r) {
for (int c = 0; c < nc; ++c) {
char yn = answers[c] ? 'Y' : 'N';
if (conditions.get(c).getSecond().charAt(r) != yn) {
continue outer;
}
}
if (r == np) {
System.out.println(" None (no problem detected)");
} else {
for (Pair<String, String> action : actions) {
if (action.getSecond().charAt(r) == 'Y') {
System.out.printf(" %s\n", action.getFirst());
}
}
}
break;
}
}
}</syntaxhighlight>
{{out}}
<pre>Please answer the following questions with a y or n:
Printer prints ? n
A red light is flashing ? n
Printer is recognized by computer ? n
Recommended action(s)
Check the power cable
Check the printer-computer cable
Ensure printer software is installed</pre>
=={{header|JavaScript}}==
===Interactive===
Since this is an interactive web page, results can't be listed. See http://jsfiddle.net/rGP6C/1/ for a live demo.
<
<head></head>
<body>
Line 908 ⟶ 1,181:
});
</script>
</html></
===DecTab object===
This implements a DecisionTable object called <code>DecTab</code>. The JavaScript dialect is Microsoft's JScript.
<
var DecTab = function () {
this.conditions = [];
Line 960 ⟶ 1,233:
}
}
</syntaxhighlight>
The task is rendered as follows
<
function Ask(q) {
WScript.StdOut.Write(q);
Line 1,014 ⟶ 1,287:
.RulesActions(["Y", "N", "Y"], [])
.Decide();
</syntaxhighlight>
And a sample run
<
C:\>CScript DecisionTable.js
Printer prints [Y/N]?Y
Line 1,022 ⟶ 1,295:
Printer is recognized by computer [Y/N]?Y
Check/replace ink.
</syntaxhighlight>
=={{header|
{{trans|Wren}}
{{works with|jq}}
'''Works with gojq, the Go implementation of jq'''
In the following solution, `input` is used to read the user's
yes/no responses, and so jq should be invoked with the -R and -n command-line options.
Because of the limitations of jq's I/O capabilities, the
prompts for this task are written to stderr, which unfortunately makes them
untidy.
<syntaxhighlight lang="jq">def get_response:
input
| if . == "Y" or . == "y" then "Y"
elif . == "N" or . == "n" then "N"
else null
end;
def ask($prompt):
def ask:
$prompt|stderr
| get_response
| if . then . else ask end;
ask;
def conditions: [
["Printer prints" , "NNNNYYYY"],
["A red light is flashing" , "YYNNYYNN"],
["Printer is recognized by computer", "NYNYNYNY"]
];
def actions: [
["Check the power cable" , "NNYNNNNN"],
["Check the printer-computer cable" , "YNYNNNNN"],
["Ensure printer software is installed", "YNYNYNYN"],
["Check/replace ink" , "YYNNNYNN"],
["Check for paper jam" , "NYNYNNNN"]
];
def interact:
conditions as $conditions
| actions as $actions
| ($conditions|length) as $nc
| ($actions|length) as $na
| ($conditions[0][1]|length) as $nr # number of rules
| 7 as $np # index of 'no problem' rule
| "Please answer the following questions with a y or n:",
( reduce range(0; $nc) as $c ( null;
.[$c] = ask("\($conditions[$c][0])? ") )) as $answers
| ("\nRecommended action(s):",
label $out
| range(0; $nr) as $r
| if all( range(0; $nc); $conditions[.][1][$r:$r+1] == $answers[.])
then if $r == $np
then "None (no problem detected)."
else $actions[] | select(.[1][$r:$r+1] == "Y") | .[0]
end,
break $out
else empty
end ) ;
interact
</syntaxhighlight>
'''Example (transcript)'''
<pre>
$ jq -rRn -f decision-tables.jq
Please answer the following questions with a y or n:
"Printer prints? "n
"A red light is flashing? "n
"Printer is recognized by computer? "n
Recommended action(s):
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
</pre>
=={{header|Julia}}==
{{trans|Perl}}
<syntaxhighlight lang="julia">const queries = [("Printer does not print", 0b11110000),
("A red light is flashing", 0b11001100),
("Printer is unrecognised", 0b10101010)]
const answers = Dict(0b00100000 => "Check the power cable",
0b10100000 => "Check the printer-computer cable",
0b10101010 => "Ensure printer software is installed",
0b11001100 => "Check/replace ink",
0b01010000 => "Check for paper jam",
0b00000001 => "Cannot diagnose any problem.")
function ynprompt(prompt)
while true
print(prompt, "?: ")
if (ans = strip(uppercase(readline()))[1]) in ['Y', 'N']
return ans
end
end
end
function decide(queries, answers)
cond = 0b11111111
for (prompt, value) in queries
cond &= (ynprompt(prompt) == 'Y' ? value : UInt8(~value))
end
for (bitpat, diagnosis) in answers
if cond & bitpat != 0
println(diagnosis)
end
end
end
decide(queries, answers)
</syntaxhighlight>{{out}}
<pre>
Printer does not print?: y
A red light is flashing?: y
Printer is unrecognised?: n
Check/replace ink
Check for paper jam
</pre>
=={{header|Kotlin}}==
<syntaxhighlight lang="scala">// version 1.1.51
val conditions = listOf(
"Printer prints" to "NNNNYYYY",
"A red light is flashing" to "YYNNYYNN",
"Printer is recognized by computer" to "NYNYNYNY"
)
val actions = listOf(
"Check the power cable" to "NNYNNNNN",
"Check the printer-computer cable" to "YNYNNNNN",
"Ensure printer software is installed" to "YNYNYNYN",
"Check/replace ink" to "YYNNNYNN",
"Check for paper jam" to "NYNYNNNN"
)
fun main(args: Array<String>) {
val nc = conditions.size
val na = actions.size
val nr = conditions[0].second.length // number of rules
val np = 7 // index of 'no problem' rule
println("Please answer the following questions with a y or n:")
val answers = BooleanArray(nc)
for (c in 0 until nc) {
var input: String
do {
print(" ${conditions[c].first} ? ")
input = readLine()!!.toUpperCase()
}
while (input != "Y" && input != "N")
answers[c] = (input == "Y")
}
println("\nRecommended action(s):")
outer@ for (r in 0 until nr) {
for (c in 0 until nc) {
val yn = if (answers[c]) 'Y' else 'N'
if (conditions[c].second[r] != yn) continue@outer
}
if (r == np) {
println(" None (no problem detected)")
}
else {
for (a in 0 until na) {
if (actions[a].second[r] == 'Y') println(" ${actions[a].first}")
}
}
return
}
}</syntaxhighlight>
Sample input/output:
<pre>
Please answer the following questions with a y or n:
Printer prints ? n
A red light is flashing ? n
Printer is recognized by computer ? n
Recommended action(s):
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
</pre>
=={{header|Lua}}==
{{trans|C++}}
<syntaxhighlight lang="lua">function promptYN(q)
local ans = '?'
repeat
io.write(q..'? ')
ans = string.upper(io.read())
until ans == 'Y' or ans == 'N'
return ans == 'Y'
end
function getCharAt(s,i)
return string.sub(s,i,i)
end
conditions = {
{"Printer prints", "NNNNYYYY"},
{"A red light is flashing", "YYNNYYNN"},
{"Printer is recognized by computer", "NYNYNYNY"},
}
actions = {
{"Check the power cable", "NNYNNNNN"},
{"Check the printer-computer cable", "YNYNNNNN"},
{"Ensure printer software is installed", "YNYNYNYN"},
{"Check/replace ink", "YYNNNYNN"},
{"Check for paper jam", "NYNYNNNN"},
}
nc = #conditions
nr = string.len(conditions[1][2])
answers = {}
print('Please answer the following questions with a y or n:')
for i,v in pairs(conditions) do
answers[i] = promptYN(v[1])
end
print('Recommended action(s)')
for r=1,nr do
local skip = false
for c=1,nc do
local yn = answers[c] and 'Y' or 'N'
if getCharAt(conditions[c][2], r) ~= yn then
skip = true
break
end
end
if not skip then
if r == nr then
print(" None (no problem detected)")
else
for i,a in pairs(actions) do
if getCharAt(a[2], r) == 'Y' then
print(" ", a[1])
end
end
end
end
end</syntaxhighlight>
{{out}}
<pre>Please answer the following questions with a y or n:
Printer prints? n
Printer is recognized by computer? n
Recommended action(s)
Check the power cable
Check the printer-computer cable
Ensure printer software is installed</pre>
=={{header|Nim}}==
We have defined a generic decision table object and used it with the Wikipedia printer example.
<syntaxhighlight lang="nim">import strutils, tables
####################################################################################################
# Generic defintion of the decision table.
type
DTable[Cond, Act: Ordinal] = object
questions: array[Cond, string]
answers: array[Act, string]
rules: Table[set[Cond], seq[Act]]
proc initDTable[Cond, Act](): DTable[Cond, Act] = discard
proc addCondition[Cond, Act](dt: var DTable[Cond, Act]; cond: Cond; question: string) =
if dt.questions[cond].len != 0:
raise newException(ValueError, "condition already set: " & $cond)
dt.questions[cond] = question
proc addAction[Cond, Act](dt: var DTable[Cond, Act]; act: Act; answer: string) =
if dt.answers[act].len != 0:
raise newException(ValueError, "action already set: " & $act)
dt.answers[act] = answer
proc addRule[Cond, Act](dt: var DTable[Cond, Act]; rule: set[Cond]; acts: openArray[Act]) =
if rule in dt.rules:
raise newException(ValueError, "rule already set.")
dt.rules[rule] = @acts
proc askQuestion(question: string): string =
while true:
stdout.write question & ' '
stdout.flushFile()
result = stdin.readLine().strip()
if result in ["y", "n"]: break
proc apply[Cond, Act](dt: DTable[Cond, Act]) =
# Build condition set.
var conds: set[Cond]
echo "Answer questions with 'y' or 'n'"
for cond, question in dt.questions:
if question.len == 0:
raise newException(ValueError, "missing question for condition: " & $cond)
let answer = askQuestion(question)
if answer == "y":
conds.incl cond
# Apply rule.
echo()
if conds in dt.rules:
echo "Actions recommended:"
for act in dt.rules[conds]:
echo "- ", dt.answers[act]
else:
echo "No action recommended."
####################################################################################################
# Decision table for Wikipedia printer example.
type
Condition {.pure.} = enum PrinterPrints, RedLightFlashing, PrinterRecognized
Action {.pure.} = enum CheckPowerCable, CheckPrinterCable, CheckSoftware, CheckInk, CheckPaperJam
const
Questions = [PrinterPrints: "Does printer print?",
RedLightFlashing: "Does red light is flashing?",
PrinterRecognized: "Is printer recognized by computer?"]
Answers = [CheckPowerCable: "check the power cable",
CheckPrinterCable: "check the printer-computer cable",
CheckSoftware: "ensure printer software is installed",
CheckInk: "check/replace ink",
CheckPaperJam: "check for paper jam"]
var dt = initDTable[Condition, Action]()
for cond, question in Questions:
dt.addCondition(cond, question)
for act, answer in Answers:
dt.addAction(act, answer)
dt.addRule({}, [CheckPowerCable, CheckPrinterCable, CheckSoftware])
dt.addRule({PrinterPrints}, [CheckSoftware])
dt.addRule({RedLightFlashing}, [CheckPrinterCable, CheckSoftware, CheckInk])
dt.addRule({PrinterRecognized}, [CheckPaperJam])
dt.addRule({PrinterPrints, RedLightFlashing}, [CheckSoftware])
dt.addRule({RedLightFlashing, PrinterRecognized}, [CheckInk, CheckPaperJam])
dt.addRule({PrinterPrints, RedLightFlashing, PrinterRecognized}, [CheckInk])
dt.apply()</syntaxhighlight>
{{out}}
<pre>Answer questions with 'y' or 'n'
Does printer print? n
Does red light is flashing? y
Is printer recognized by computer? y
Actions recommended:
- check/replace ink
- check for paper jam</pre>
=={{header|Perl}}==
<syntaxhighlight lang="perl" line>use v5.36;
sub decide($q,$a) {
my @q = @{$q};
my %a = %{$a};
my($cnt,$bit) = (1,0);
for my $prompt (@q) {
print "$prompt: ";
$bit += $cnt if <> =~ /y/i;
$cnt *= 2;
}
$bit = 2**$bit;
while (my ($bitpat,$diagnosis) = each %a) {
print "$diagnosis\n" if $bit & $bitpat;
}
}
my @queries = (
'Printer is unrecognised',
'A red light is flashing',
'Printer does not print',
);
my %answers = (
0b00100000 => 'Check the power cable',
0b10100000 => 'Check the printer-computer cable',
0b10101010 => 'Ensure printer software is installed',
0b11001100 => 'Check/replace ink',
0b01010000 => 'Check for paper jam',
);
decide(\@queries,\%answers);</syntaxhighlight>
{{out}}
<pre>Printer is unrecognised: n
A red light is flashing: n
Printer does not print: y
Check for paper jam</pre>
=={{header|Phix}}==
Written such that conditions and actions could easily be read from a plain text file,
and should cope fairly well with different lengths, missing/conflicting options, etc.
=== console version ===
<!--<syntaxhighlight lang="phix">-->
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (wait_key)</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">conditions</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
YYYYNNNN:Printer does not print
YYNNYYNN:A red light is flashing
YNYNYNYN:Printer is unrecognized
"""</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">actions</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
--X-----:Check the power cable
X-X-----:Check the printer-computer cable
X-X-X-X-:Ensure printer software is installed
XX--XX--:Check/replace ink
-X-X----:Check for paper jam
"""</span>
<span style="color: #008080;">procedure</span> <span style="color: #000000;">validate</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">string</span> <span style="color: #000000;">letters</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">name</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">remainder</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">),</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">throw</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"uneven %s pairings"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">name</span><span style="color: #0000FF;">}))</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">by</span> <span style="color: #000000;">2</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">si</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">si</span><span style="color: #0000FF;">)!=</span><span style="color: #000000;">l</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">throw</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"mismatched lengths (line %d)"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">i</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">si</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #008080;">not</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">si</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">],</span><span style="color: #000000;">letters</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">throw</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"invalid letter [%c not in %s]"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">si</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">],</span><span style="color: #000000;">letters</span><span style="color: #0000FF;">}))</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">qa</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split_any</span><span style="color: #0000FF;">(</span><span style="color: #000000;">conditions</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n:"</span><span style="color: #0000FF;">),</span>
<span style="color: #000000;">sa</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split_any</span><span style="color: #0000FF;">(</span><span style="color: #000000;">actions</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n:"</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qa</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">ask_questions</span><span style="color: #0000FF;">()</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">valid</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #000000;">l</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">a</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qa</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">by</span> <span style="color: #000000;">2</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">while</span> <span style="color: #004600;">true</span> <span style="color: #008080;">do</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">qa</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]&</span><span style="color: #008000;">":? "</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">a</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">upper</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">wait_key</span><span style="color: #0000FF;">())</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"YN"</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\nplease enter Y or N\n"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%c\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">l</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">qa</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">][</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span> <span style="color: #000000;">valid</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">false</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">valid</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">procedure</span> <span style="color: #000000;">show_answers</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">count</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sa</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">by</span> <span style="color: #000000;">2</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">sa</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">][</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'X'</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">sa</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]&</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">count</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%d answers\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">count</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
<span style="color: #008080;">procedure</span> <span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
<span style="color: #008080;">try</span>
<span style="color: #000000;">validate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qa</span><span style="color: #0000FF;">,</span><span style="color: #000000;">l</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"YN"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"condition"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">validate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sa</span><span style="color: #0000FF;">,</span><span style="color: #000000;">l</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"-X"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"action"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">catch</span> <span style="color: #000000;">e</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">e</span>
<span style="color: #7060A8;">abort</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">try</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">valid</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">ask_questions</span><span style="color: #0000FF;">()</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">sv</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sum</span><span style="color: #0000FF;">(</span><span style="color: #000000;">valid</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">sv</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"no answers"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">elsif</span> <span style="color: #000000;">sv</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">show_answers</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #000000;">valid</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">else</span>
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"multiple answer sets\n"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">valid</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">valid</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"for %d:\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">i</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">show_answers</span><span style="color: #0000FF;">(</span><span style="color: #000000;">i</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
<span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
<!--</syntaxhighlight>-->
{{out}}
<pre>
Printer does not print:? N
A red light is flashing:? Y
Printer is unrecognized:? Y
Ensure printer software is installed
Check/replace ink
2 answers
</pre>
=== GUI version ===
{{libheader|Phix/pGUI}}
<!--<syntaxhighlight lang="phix">(phixonline)-->
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">conditions</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
YYYYNNNN:Printer does not print
YYNNYYNN:A red light is flashing
YNYNYNYN:Printer is unrecognized
"""</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">actions</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
--X-----:Check the power cable
X-X-----:Check the printer-computer cable
X-X-X-X-:Ensure printer software is installed
XX--XX--:Check/replace ink
-X-X----:Check for paper jam
"""</span>
<span style="color: #008080;">constant</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">qyn</span><span style="color: #0000FF;">,</span><span style="color: #000000;">qus</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">columnize</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">apply</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #000000;">conditions</span><span style="color: #0000FF;">,</span><span style="color: #008000;">'\n'</span><span style="color: #0000FF;">),</span><span style="color: #008000;">':'</span><span style="color: #0000FF;">})),</span>
<span style="color: #0000FF;">{</span><span style="color: #000000;">a_x</span><span style="color: #0000FF;">,</span><span style="color: #000000;">act</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">columnize</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">apply</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #000000;">actions</span><span style="color: #0000FF;">,</span><span style="color: #008000;">'\n'</span><span style="color: #0000FF;">),</span><span style="color: #008000;">':'</span><span style="color: #0000FF;">}))</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">nq</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qus</span><span style="color: #0000FF;">),</span> <span style="color: #000000;">na</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">act</span><span style="color: #0000FF;">),</span> <span style="color: #000000;">ynl</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qyn</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span>
<span style="color: #7060A8;">assert</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">apply</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qyn</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">)=</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ynl</span><span style="color: #0000FF;">,</span><span style="color: #000000;">nq</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"mismatched YN lengths"</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">assert</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">apply</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a_x</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">)=</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ynl</span><span style="color: #0000FF;">,</span><span style="color: #000000;">na</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"mismatched X- lengths"</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">assert</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">unique</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">qyn</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">))=</span><span style="color: #008000;">"NY"</span> <span style="color: #008080;">and</span> <span style="color: #7060A8;">unique</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">a_x</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">))=</span><span style="color: #008000;">"-X"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">title</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"Decision_tables"</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">help_text</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
Check all that apply and press the "Get Answers" button.
"""</span>
<span style="color: #008080;">include</span> <span style="color: #000000;">pGUI</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
<span style="color: #004080;">Ihandle</span> <span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">tbox</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">hbox</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">vbox</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">okbtn</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">answers</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">toggles</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">show_help</span><span style="color: #0000FF;">()</span>
<span style="color: #7060A8;">IupMessage</span><span style="color: #0000FF;">(</span><span style="color: #000000;">title</span><span style="color: #0000FF;">,</span><span style="color: #000000;">help_text</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #004600;">IUP_IGNORE</span> <span style="color: #000080;font-style:italic;">-- (don't open browser help!)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">button_cb</span><span style="color: #0000FF;">(</span><span style="color: #004080;">Ihandle</span> <span style="color: #000080;font-style:italic;">/*okbtn*/</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">valid</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #000000;">ynl</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">nq</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">yn</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"YN"</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">-</span><span style="color: #7060A8;">IupGetInt</span><span style="color: #0000FF;">(</span><span style="color: #000000;">toggles</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">],</span><span style="color: #008000;">"VALUE"</span><span style="color: #0000FF;">)]</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">ynl</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">yn</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">qyn</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">][</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span> <span style="color: #000000;">valid</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">false</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">sv</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sum</span><span style="color: #0000FF;">(</span><span style="color: #000000;">valid</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">answer</span> <span style="color: #0000FF;">=</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sv</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span><span style="color: #0000FF;">?</span><span style="color: #008000;">"no answers"</span><span style="color: #0000FF;">:</span>
<span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">sv</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">?</span><span style="color: #008000;">""</span><span style="color: #0000FF;">:</span><span style="color: #008000;">"multiple answer sets\n"</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">sv</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">ynl</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">valid</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">sv</span><span style="color: #0000FF;">></span><span style="color: #000000;">1</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">answer</span> <span style="color: #0000FF;">&=</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"for %d:\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">i</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">actions</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">na</span> <span style="color: #008080;">do</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">a_x</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">][</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'X'</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">actions</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">actions</span><span style="color: #0000FF;">,</span><span style="color: #000000;">act</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">])</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #000000;">actions</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">actions</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"%d answers\n"</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">actions</span><span style="color: #0000FF;">)))</span>
<span style="color: #000000;">answer</span> <span style="color: #0000FF;">&=</span> <span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">actions</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #7060A8;">IupSetStrAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">answers</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"TITLE"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">answer</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">IupSetAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"SIZE"</span><span style="color: #0000FF;">,</span><span style="color: #004600;">NULL</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">IupRefresh</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #004600;">IUP_DEFAULT</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">key_cb</span><span style="color: #0000FF;">(</span><span style="color: #004080;">Ihandle</span> <span style="color: #000080;font-style:italic;">/*dlg*/</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #004600;">K_ESC</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #004600;">IUP_CLOSE</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span> <span style="color: #000080;font-style:italic;">-- (standard practice for me)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #004600;">K_F5</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #004600;">IUP_DEFAULT</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span> <span style="color: #000080;font-style:italic;">-- (let browser reload work)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #004600;">K_F1</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">show_help</span><span style="color: #0000FF;">()</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #004600;">K_CR</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">button_cb</span><span style="color: #0000FF;">(</span><span style="color: #000000;">okbtn</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">return</span> <span style="color: #004600;">IUP_IGNORE</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #7060A8;">IupOpen</span><span style="color: #0000FF;">()</span>
<span style="color: #000000;">toggles</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">apply</span><span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">IupToggle</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">qus</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"RIGHTBUTTON=YES, CANFOCUS=NO"</span><span style="color: #0000FF;">}})</span>
<span style="color: #000000;">okbtn</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupButton</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"Get Answers"</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">Icallback</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"button_cb"</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"PADDING=5x5"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">answers</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupLabel</span><span style="color: #0000FF;">(</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"EXPAND=BOTH, PADDING=10x10"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">tbox</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupVbox</span><span style="color: #0000FF;">(</span><span style="color: #000000;">toggles</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"ALIGNMENT=ARIGHT"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">hbox</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupHbox</span><span style="color: #0000FF;">({</span><span style="color: #000000;">tbox</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">IupVbox</span><span style="color: #0000FF;">({</span><span style="color: #7060A8;">IupLabel</span><span style="color: #0000FF;">(),</span><span style="color: #000000;">okbtn</span><span style="color: #0000FF;">})})</span>
<span style="color: #000000;">vbox</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupVbox</span><span style="color: #0000FF;">({</span><span style="color: #000000;">hbox</span><span style="color: #0000FF;">,</span><span style="color: #000000;">answers</span><span style="color: #0000FF;">},</span><span style="color: #008000;">"MARGIN=20x10"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">dlg</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupDialog</span><span style="color: #0000FF;">(</span><span style="color: #000000;">vbox</span><span style="color: #0000FF;">,</span><span style="color: #008000;">`TITLE="%s", MINSIZE=540x200`</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">title</span><span style="color: #0000FF;">})</span>
<span style="color: #7060A8;">IupShow</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">IupSetCallback</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"KEY_CB"</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">Icallback</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"key_cb"</span><span style="color: #0000FF;">))</span>
<span style="color: #7060A8;">IupSetAttributeHandle</span><span style="color: #0000FF;">(</span><span style="color: #004600;">NULL</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"PARENTDIALOG"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">platform</span><span style="color: #0000FF;">()!=</span><span style="color: #004600;">JS</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">IupMainLoop</span><span style="color: #0000FF;">()</span>
<span style="color: #7060A8;">IupClose</span><span style="color: #0000FF;">()</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<!--</syntaxhighlight>-->
=={{header|Picat}}==
===Interactive version===
<syntaxhighlight lang="picat">import util.
%
% Interactive version.
% Answer with YnNn
%
go =>
conditions(Conditions),
solutions(Solutions),
Answers=query(Conditions),
println(join(decision_table(Solutions,Answers),'\n')),
nl.
%
% Query the user about the problem.
% Valid responses: YyNn
%
query(Conditions) = Answers =>
Answers = [0 : _I in 1..Conditions[1,2].length],
println("Please answer the questions with YyNn."),
foreach([Text,Cond] in Conditions)
A = "",
while (not(membchk(A, ["Y","N","y","n"])))
printf("%s? ", Text),
A := read_line(),
if membchk(A,["Y","y"]) then
Answers := map(\/, Answers,Cond)
end
end
end,
nl.
%
% Get the result given the answers (list of 01).
%
decision_table(Solutions,Answers) = Result =>
Result = [],
if sum(Answers) = 0 then
Result := ["Nice, no problem."]
else
foreach([Text,Sol] in Solutions)
if map(/\,Sol,Answers) == Sol then
Result := Result ++ [Text]
end
end
end.
conditions(Conditions) =>
Conditions = [
["Printer does not print", [1,1,1,1,0,0,0,0]],
["A red light is flashing", [1,1,0,0,1,1,0,0]],
["Printer is unrecognised", [1,0,1,0,1,0,1,0]]
].
solutions(Solutions) =>
Solutions = [
["Check the power cable", [0,0,1,0,0,0,0,0]],
["Check the printer-computer cable", [1,0,1,0,0,0,0,0]],
["Ensure printer software is installed",[1,0,1,0,1,0,1,0]],
["Check/replace ink", [1,1,0,0,1,1,0,0]],
["Check for paper jam", [0,1,0,1,0,0,0,0]]
].</syntaxhighlight>
{{out}}
<pre>
Please answer the questions with YyNn.
Printer does not print? y
A red light is flashing? n
Printer is unrecognised? y
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
Check for paper jam</pre>
===All possible answers/combinations===
For debugging purposes it it's nice to be able to print all the possible combinations of answers/solutions.
<syntaxhighlight lang="picat">%
% Go through all combinations of answers
%
go2 =>
PS = power_set([1,2,3]).delete([]).sort(),
println(PS),
conditions(Conditions),
solutions(Solutions),
AllCond = [Cond : [_,Cond] in Conditions],
foreach(P in PS)
println(p=P),
println(conditions=join([Conditions[I].first() : I in P],', ')),
A = [0:_I in 1..Conditions[1,2].length],
foreach(C in [AllCond[I] : I in P])
A := map(\/,A,C)
end,
println(a=A),
println(join(decision_table(Solutions,A),'\n')),
nl
end,
nl.</syntaxhighlight>
{{out}}
(truncated)
<pre>
p = [1]
conditions = Printer does not print
a = [1,1,1,1,0,0,0,0]
Check the power cable
Check the printer-computer cable
Check for paper jam
p = [1,2]
conditions = Printer does not print, A red light is flashing
a = [1,1,1,1,1,1,0,0]
Check the power cable
Check the printer-computer cable
Check/replace ink
Check for paper jam
p = [1,2,3]
conditions = Printer does not print, A red light is flashing, Printer is unrecognised
a = [1,1,1,1,1,1,1,0]
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
Check/replace ink
Check for paper jam
...
</pre>
=={{header|PicoLisp}}==
We allow ourselves a luxurious user interface:
<
(out NIL (prin (car Cond) "? "))
(in NIL
Line 1,084 ⟶ 2,048:
T )
(T (member Reply '(NIL N NO No n no false 0)))
(prinl "Please answer 'Yes' or 'No'") ) ) ) )</
The decision table used in the example:
<
("Printer does not print" T T T T NIL NIL NIL NIL)
("A red light is flashing" T T NIL NIL T T NIL NIL)
Line 1,096 ⟶ 2,060:
("Ensure printer software is installed" T NIL T NIL T NIL T)
("Check/replace ink" T T NIL NIL T T)
("Check for paper jam" NIL T NIL T) )</
The decision can be made directly on the condition and action data, without the need to create intermediate tables:
<
(let Reply (mapcar yes? *Conditions)
(extract and
Line 1,105 ⟶ 2,069:
(unless (pick '((Flg) (<> Flg (next))) Reply)
(rest) ) ) )
(mapcar car *Actions) ) ) )</
Output:
<pre>: (decide)
Line 1,126 ⟶ 2,090:
=={{header|Python}}==
<
'''
Create a Decision table then use it
Line 1,165 ⟶ 2,129:
dt_user(dt)
dt_user(dt)
dt_user(dt)</
'''Sample Run'''
Line 1,216 ⟶ 2,180:
Try this:
Pray!</pre>
=={{header|Quackery}}==
<syntaxhighlight lang="Quackery"> [ say "Check power cable." cr ] is cpc ( --> )
[ say "Check printer-computer cable." cr ] is cpcc ( --> )
[ say "Ensure printer software installed." cr ] is epsi ( --> )
[ say "Check/replace ink." cr ] is cri ( --> )
[ say "Check for paper jam." cr ] is cpj ( --> )
[ say "No problem detected." cr ] is npd ( --> )
[ [ dup $ " (y/n) " join input
dup $ "" = iff drop again ]
nip 0 peek upper char Y = ] is condition ( $ --> b )
[ $ "Does the printer print?"
condition
$ "Is a red light flashing?"
condition
$ "Does the computer recognise the printer?"
condition
1 << | 1 << |
[ table
( n n n ) [ cpc cpcc epsi ]
( y n n ) epsi
( n y n ) [ cpcc epsi cri ]
( y y n ) epsi
( n n y ) cpj
( y n y ) npd
( n y y ) [ cri cpj ]
( y y y ) cri ]
cr do ] is diagnose ( --> )</syntaxhighlight>
{{out}}
As a dialogue in the Quackery shell.
<pre>/O> diagnose
...
Does the printer print? (y/n) n
Is a red light flashing? (y/n) n
Does the computer recognise the printer? (y/n) y
Check for paper jam.
</pre>
=={{header|Racket}}==
Line 1,222 ⟶ 2,231:
I thought it might be fun to merge them.
<
(define (ask-y/n q)
Line 1,309 ⟶ 2,318:
╚═╩════════════╩════════════════════════════════════════════╩═╩═╩═╩═╩═══════╝)
(run-decision-table printer-troubleshooting-2dtable)</
{{out}}
Line 1,318 ⟶ 2,327:
Printer is unrecognized [y/n]?n
Suggested action: (Check/replace ink)</pre>
=={{header|Raku}}==
(formerly Perl 6)
<syntaxhighlight lang="raku" line>sub decide (@q, @s) {
my $bit = 2 ** [+] (1,2,4...*) Z* reverse @q.map: {
so prompt(.value ~ "? ") ~~ /:i ^y/;
}
say " $_" for @s.grep(*.key +& $bit)».value || "No clue!";
}
loop {
decide
(
"Y Y Y Y N N N N" => "Printer does not print",
"Y Y N N Y Y N N" => "A red light is flashing",
"Y N Y N Y N Y N" => "Printer is unrecognised",
),
(
:2<0_0_1_0_0_0_0_0> => "Check the power cable",
:2<1_0_1_0_0_0_0_0> => "Check the printer-computer cable",
:2<1_0_1_0_1_0_1_0> => "Ensure printer software is installed",
:2<1_1_0_0_1_1_0_0> => "Check/replace ink",
:2<0_1_0_1_0_0_0_0> => "Check for paper jam",
);
say '';
}</syntaxhighlight>
A bit of explanation: we pass in two pair lists for the questions and solutions; we ignore the keys of the questions, since they can be
generated by regarding them as a binary counter from right to left, with the least significant bit on the bottom. The <tt>@q.map</tt> runs the prompts and maps them to booleans
using case-insensitive matching. We reverse that list and zip multiply with powers of two to figure out which bit we're going to grep for. (The zip stops on the shorter list, which is always going to be the list of booleans, since the list of powers of two is infinite.) We sum up those powers of two using a <tt>[+]</tt> reduction metaoperator, which in this case gives us a number from 0 to 7. Then we take 2 to that power.
The solutions list of pairs is conveniently keyed on binary numbers written in colon radix notation, so we grep the keys containing the correct bit, then map the pair list to its values using a hyperoperator to parallelize it. Unlike in Perl 5, we can use <tt>||</tt> on lists as well as scalars to provide a default result if nothing matches.
{{out}}
<pre>Printer does not print? n
A red light is flashing? y
Printer is unrecognised? n
Check/replace ink
Printer does not print? y
A red light is flashing? n
Printer is unrecognised? y
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
Printer does not print? n
A red light is flashing? n
Printer is unrecognised? n
No clue!
Printer does not print? ^C</pre>
=={{header|REXX}}==
Line 1,332 ⟶ 2,391:
::* visual fidelity aids for postmortem analysis (as in logs)
::* a method of allowing the user to quit (opt-out of) the interrogation
<
Q.=; Q.1 = 'Does the printer not print?'
Q.2 = 'Is there a red light flashing on the printer?'
Q.3 = 'Is the printer unrecognized by the software?'
Q.0 = 3 /*the number of questions to be asked. */
action.= /* Y=yes N=no if character isn't a letter = don't care.*/
Line 1,344 ⟶ 2,403:
/* │││ */
/* ↓↓↓ */
action.1 = 'yny' ; pos.1 =
action.2 = 'y.y' ; pos.2 =
action.3 = '..y' ; pos.3 =
action.4 = '.y.' ; pos.4 =
action.5 = 'y.n' ; pos.5 =
do i=1
end /*i*/
say /*display a blank line before questions*/
possible=
do k=1 while action.k\=='' /*filter the answers via decision table*/
do j=1; d= substr(action.k, j, 1); upper d
jm= j//Q.0;
if d==' ' then leave
if \datatype(d, 'U') then iterate
if d\==ans.jm then iterate k
end /*j*/
say pos.k /*this could be a possible solution. */
possible= possible +
end /*k*/
if possible==0 then say '
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
asker: arg ?; oops= 0;
howTo = '(You can answer with a Yes or No [or Quit])'
do forever
if oops then do; say; say right(howTo, 79); say; oops=
end
if
if
say 'invalid response: ' x; oops= 1
end /*forever*/</syntaxhighlight>
{{out|output|text= (a screen scraping using a DOS prompt window for some of the possible responses):}}
('''decision.rex''' is the name of the REXX program that produced this output.)
<pre style="height:72ex">
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
no ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
No ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
n ◄■■■■■■■■ user input.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
n ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
n ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
yes ◄■■■■■■■■ user input.
═════════ Ensure printer software is installed.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
n ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
Ye ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
n ◄■■■■■■■■ user input.
═════════ Check/replace ink.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
n ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
yes. ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
yes ◄■■■■■■■■ user input.
═════════ Ensure printer software is installed.
═════════ Check/replace ink.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
y ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
no ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
no ◄■■■■■■■■ user input.
═════════ Check for paper jam.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
y ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
n ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
y ◄■■■■■■■■ user input.
═════════ Check the power cable.
═════════ check the printer-computer cable.
═════════ Ensure printer software is installed.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
y ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
y ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
n ◄■■■■■■■■ user input.
═════════ Check/replace ink.
═════════ Check for paper jam.
D:\►rexx decision
───────── (question 1 of 3) Does the printer not print?
y ◄■■■■■■■■ user input.
───────── (question 2 of 3) Is there a red light flashing on the printer?
y ◄■■■■■■■■ user input.
───────── (question 3 of 3) Is the printer unrecognized by the software?
y ◄■■■■■■■■ user input.
═════════ check the printer-computer cable.
═════════ Ensure printer software is installed.
═════════ Check/replace ink.
D:\►
</pre>
=={{header|Ring}}==
<syntaxhighlight lang="ring">
# Project : Decision tables
see "The printer does not print (Y or N) "
give notprinting
see "A red light is upper(flashing) (Y or N) "
give flashing
see "The printer is unrecognized (Y or N) "
give notrecognized
if upper(notprinting) = "Y" and upper(flashing) = "Y" and upper(notrecognized) = "Y"
see "Check the printer-computer cable" + nl
see "Ensure printer software is installed" + nl
see "Check/replace ink"
elseif upper(notprinting) = "Y" and upper(flashing) = "Y" upper(notrecognized) = "N"
see "Check/replace ink" + nl
see "Check for paper jam" + nl
elseif upper(notprinting) = "Y" and upper(flashing) = "N" and upper(notrecognized) = "Y"
see "Check the power cable"
see "Check the printer-computer cable" + nl
see "Ensure printer software is installed" + nl
elseif upper(notprinting) = "Y" and upper(flashing) = "N" and upper(notrecognized) = "N"
see "Check for paper jam" + nl
elseif upper(notprinting) = "N" and upper(flashing) = "Y" and upper(notrecognized) = "Y"
see "Ensure printer software is installed" + nl
see "Check/replace ink" + nl
elseif upper(notprinting) = "N" and upper(flashing) = "Y" and upper(notrecognized) = "N"
see "Check/replace ink" + nl
elseif upper(notprinting) = "N" and upper(flashing) = "N" and upper(notrecognized) = "Y"
see "Ensure printer software is installed" + nl
elseif upper(notprinting) = "N" and upper(flashing) = "N" and upper(notrecognized) = "N"
see "no action found" + nl
else
see "invalid input: " + upper(notprinting) + " " + upper(flashing) + " " + upper(notrecognized) + nl
ok
</syntaxhighlight>
Output:
<pre>
The printer does not print (Y or N) y
A red light is upper(flashing) (Y or N) y
The printer is unrecognized (Y or N) y
Check the printer-computer cable
Ensure printer software is installed
Check/replace ink
</pre>
=={{header|Ruby}}==
<
def initialize(conditions, actions)
@conditions = conditions
Line 1,528 ⟶ 2,636:
]
)
loop {dt.run}</
Example
Line 1,592 ⟶ 2,700:
Actions:
PC LOAD LETTER</pre>
=={{header|Scala}}==
{{trans|Java}}
<syntaxhighlight lang="scala">import java.io.{BufferedReader, InputStreamReader}
import scala.util.control.Breaks
object DecisionTables {
val conditions = List(
("Printer prints", "NNNNYYYY"),
("A red light is flashing", "YYNNYYNN"),
("Printer is recognized by computer", "NYNYNYNY")
)
val actions = List(
("Check the power cable", "NNYNNNNN"),
("Check the printer-computer cable", "YNYNNNNN"),
("Ensure printer software is installed", "YNYNYNYN"),
("Check/replace ink", "YYNNNYNN"),
("Check for paper jam", "NYNYNNNN")
)
def main(args: Array[String]): Unit = {
// var x = (1, 2)
// println(x)
// println(conditions)
// println(actions)
val nc = conditions.size
val na = actions.size
val nr = conditions.head._2.length
val np = 7
val br = new BufferedReader(new InputStreamReader(System.in))
println("Please answer the following questions with a y or n:")
val answers = Array.ofDim[Boolean](nc)
for (c <- 0 until nc) {
var input = ""
do {
printf(" %s ? ", conditions(c)._1)
input = br.readLine().toUpperCase
} while (input != "Y" && input != "N")
answers(c) = input == "Y"
}
println("\nRecommended actions(s)")
val Outer = new Breaks
val Inner = new Breaks
Outer.breakable {
for (r <- 0 until nr) {
var outer = true
Inner.breakable {
for (c <- 0 until nc) {
val yn = if (answers(c)) 'Y' else 'N'
if (conditions(c)._2(r) != yn) {
outer = false
Inner.break
}
}
}
if (outer) {
if (r == np) {
println(" None (no problem detected)")
} else {
for (action <- actions) {
if (action._2(r) == 'Y') {
printf(" %s\n", action._1)
}
}
}
Outer.break
}
}
}
}
}</syntaxhighlight>
{{out}}
<pre>Please answer the following questions with a y or n:
Printer prints ? y
A red light is flashing ? y
Printer is recognized by computer ? y
Recommended actions(s)
Check/replace ink</pre>
=={{header|Sidef}}==
{{trans|
<
var bits = q.map { |p|
Line 1,630 ⟶ 2,825:
)
say ''
}</
{{out}}
<pre>
Line 1,657 ⟶ 2,852:
Printer does not print? ^C
</pre>
=={{header|Tcl}}==
<
#http://rosettacode.org/wiki/Keyboard_Input/Obtain_a_Y_or_N_response#Tcl
Line 1,697 ⟶ 2,893:
}
}
}</
Demonstration:
<
"Printer does not print"
"A red light is flashing"
Line 1,710 ⟶ 2,906:
"Check for paper jam" {0 1 0 1}
}
printerDiagnosisTable consult</
Output:
<pre>
Line 1,718 ⟶ 2,914:
Ensure printer software is installed
Check/replace ink
</pre>
=={{header|Wren}}==
{{trans|Kotlin}}
{{libheader|Wren-str}}
<syntaxhighlight lang="wren">import "io" for Stdin, Stdout
import "./str" for Str
var conditions = [
["Printer prints" , "NNNNYYYY"],
["A red light is flashing" , "YYNNYYNN"],
["Printer is recognized by computer", "NYNYNYNY"]
]
var actions = [
["Check the power cable" , "NNYNNNNN"],
["Check the printer-computer cable" , "YNYNNNNN"],
["Ensure printer software is installed", "YNYNYNYN"],
["Check/replace ink" , "YYNNNYNN"],
["Check for paper jam" , "NYNYNNNN"]
]
var nc = conditions.count
var na = actions.count
var nr = conditions[0][1].count // number of rules
var np = 7 // index of 'no problem' rule
System.print("Please answer the following questions with a y or n:")
var answers = List.filled(nc, false)
for (c in 0...nc) {
var input
while (true) {
System.write(" %(conditions[c][0]) ? ")
Stdout.flush()
input = Str.upper(Stdin.readLine())
if (input == "Y" || input == "N") break
}
answers[c] = (input == "Y")
}
System.print("\nRecommended action(s):")
for (r in 0...nr) {
var outer = false
for (c in 0...nc) {
var yn = answers[c] ? "Y" : "N"
if (conditions[c][1][r] != yn) {
outer = true
break
}
}
if (!outer) {
if (r == np) {
System.print(" None (no problem detected)")
} else {
for (a in 0...na) {
if (actions[a][1][r] == "Y") System.print(" %(actions[a][0])")
}
}
break
}
}</syntaxhighlight>
{{out}}
Sample input/output:
<pre>
Please answer the following questions with a y or n:
Printer prints ? n
A red light is flashing ? n
Printer is recognized by computer ? n
Recommended action(s):
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
</pre>
=={{header|XPL0}}==
{{trans|Wren}}
<syntaxhighlight lang "XPL0">include xpllib; \for ToUpper, Print
int Conditions, Actions, NC, NA, NR, NP, Answers(3), Input, Outer, YN, R, C, A;
char S;
[Conditions:= [
["Printer prints" , "NNNNYYYY"],
["A red light is flashing" , "YYNNYYNN"],
["Printer is recognized by computer", "NYNYNYNY"]
];
Actions:= [
["Check the power cable" , "NNYNNNNN"],
["Check the printer-computer cable" , "YNYNNNNN"],
["Ensure printer software is installed", "YNYNYNYN"],
["Check/replace ink" , "YYNNNYNN"],
["Check for paper jam" , "NYNYNNNN"]
];
NC:= 3;
NA:= 5;
NR:= 8; \number of rules
NP:= 7; \index of 'no problem' rule
Print("Please answer the following questions with a y or n:\n");
for C:= 0 to NC-1 do
[loop [Print(" %s ? ", Conditions(C,0));
OpenI(0);
Input:= ToUpper(ChIn(0));
if Input = ^Y or Input = ^N then quit;
];
Answers(C):= Input = ^Y;
];
Print("\nRecommended action(s):\n");
for R:= 0 to NR-1 do
[Outer:= false;
for C:= 0 to NC-1 do
[YN:= if Answers(C) then ^Y else ^N;
S:= Conditions(C,1); \to access character bytes not integers
if S(R) # YN then
[Outer:= true;
C:= NC; \break
];
];
if not Outer then
[if R = NP then
Print(" None (no problem detected)\n")
else [for A:= 0 to NA-1 do
[S:= Actions(A,1);
if S(R) = ^Y then
Print(" %s\n", Actions(A,0));
];
];
R:= NR; \break
];
];
]</syntaxhighlight>
{{out}}
<pre>
Please answer the following questions with a y or n:
Printer prints ? n
A red light is flashing ? n
Printer is recognized by computer ? n
Recommended action(s):
Check the power cable
Check the printer-computer cable
Ensure printer software is installed
</pre>
| |||