Two bullet roulette: Difference between revisions
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{{
The following is supposedly a question given to mathematics graduates seeking jobs on Wall Street:
<blockquote>
A revolver handgun has a revolving cylinder with six chambers for bullets.
It is loaded with the following procedure:
1. Check the first chamber to the right of the trigger for a bullet. If a bullet
is seen, the cylinder is rotated one chamber clockwise and the next chamber
checked until an empty chamber is found.
2. A cartridge containing a bullet is placed in the empty chamber.
3. The cylinder is then rotated one chamber clockwise.
To randomize the cylinder's position, the cylinder is spun, which causes the cylinder to take
a random position from 1 to 6 chamber rotations clockwise from its starting position.
When the
counterclockwise from the loading position.
The gun is unloaded by removing all cartridges from the cylinder.
According to the legend, a suicidal Russian imperial military officer plays a game of Russian
roulette by putting two bullets in a six-chamber cylinder and pulls the trigger twice.
If the gun fires with a trigger pull, this is considered a successful suicide.
The cylinder is always spun before the first shot, but it may or may not be spun after putting
in the first bullet and may or may not be spun after taking the first shot.
Which of the following situations produces the highest probability of suicide?
A. Spinning the cylinder after loading the first bullet, and spinning again after the first shot.
B. Spinning the cylinder after loading the first bullet only.
C. Spinning the cylinder after firing the first shot only.
D. Not spinning the cylinder either after loading the first
E. The probability is the same for all cases.
</blockquote>
;Task:
# Run a repeated simulation of each of the above scenario, calculating the percentage of suicide with a randomization of the four spinning, loading and firing order scenarios.
# Show the results as a percentage of deaths for each type of scenario.
# The hand calculated probabilities are 5/9, 7/12, 5/9, and 1/2. A correct program should produce results close enough to those to allow a correct response to the interview question.
;Reference:
<br><br>
=={{header|11l}}==
{{trans|Go}}
<syntaxhighlight lang="11l">UInt32 seed = 0
F nonrandom(n)
:seed = 1664525 * :seed + 1013904223
R Int(:seed >> 16) % n
V cylinder = [0B] * 6
F rshift()
V t = :cylinder[5]
L(i) (4..0).step(-1)
:cylinder[i + 1] = :cylinder[i]
:cylinder[0] = t
F unload()
L(i) 6
:cylinder[i] = 0B
F load()
L :cylinder[0]
rshift()
:cylinder[0] = 1B
rshift()
F spin()
L 1..nonrandom(6)
rshift()
F fire()
V shot = :cylinder[0]
rshift()
R shot
F method(s)
unload()
L(c) s
S c
‘L’
load()
‘S’
spin()
‘F’
I fire()
R 1
R 0
F mstring(s)
[String] l
L(c) s
S c
‘L’
l [+]= ‘load’
‘S’
l [+]= ‘spin’
‘F’
l [+]= ‘fire’
R l.join(‘, ’)
V tests = 100000
L(m) [‘LSLSFSF’, ‘LSLSFF’, ‘LLSFSF’, ‘LLSFF’]
V sum = 0
L 0 .< tests
sum += method(m)
V pc = Float(sum) * 100 / tests
print(‘#<40 produces #2.3% deaths.’.format(mstring(m), pc))</syntaxhighlight>
{{out}}
<pre>
load, spin, load, spin, fire, spin, fire produces 55.434% deaths.
load, spin, load, spin, fire, fire produces 58.373% deaths.
load, load, spin, fire, spin, fire produces 55.428% deaths.
load, load, spin, fire, fire produces 50.041% deaths.
</pre>
=={{header|AutoHotkey}}==
<syntaxhighlight lang="autohotkey">methods =
(
load, spin, load, spin, fire, spin, fire
load, spin, load, spin, fire, fire
load, load, spin, fire, spin, fire
load, load, spin, fire, fire
)
for i, method in StrSplit(methods, "`n", "`r"){
death := 0
main:
loop 100000 {
sixGun := []
for i, v in StrSplit(StrReplace(method," "), ",")
if %v%()
continue, main
}
output .= Format("{1:0.3f}", death/1000) "% Deaths for : """ method """`n"
}
MsgBox % output
return
load(){
global
if !sixGun.Count()
sixGun := [0,1,0,0,0,0]
else
if sixGun[2]
sixGun[1] := 1
sixGun[2] := 1
}
fire(){
global
if bullet := sixGun[1]
death++
temp := sixGun[6]
loop, 5
sixGun[7-A_Index] := sixGun[6-A_Index]
sixGun[1] := temp
return bullet
}
spin(){
global
Random, rnd, 1, 12
loop, % rnd {
temp := sixGun[6]
loop, 5
sixGun[7-A_Index] := sixGun[6-A_Index]
sixGun[1] := temp
}
}</syntaxhighlight>
{{out}}
<pre>55.478% Deaths for : "load, spin, load, spin, fire, spin, fire"
58.210% Deaths for : "load, spin, load, spin, fire, fire"
55.782% Deaths for : "load, load, spin, fire, spin, fire"
50.280% Deaths for : "load, load, spin, fire, fire"</pre>
=={{header|C}}==
{{trans|Go}}
<syntaxhighlight lang="c">#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
static int nextInt(int size) {
return rand() % size;
}
static bool cylinder[6];
static void rshift() {
bool t = cylinder[5];
int i;
for (i = 4; i >= 0; i--) {
cylinder[i + 1] = cylinder[i];
}
cylinder[0] = t;
}
static void unload() {
int i;
for (i = 0; i < 6; i++) {
cylinder[i] = false;
}
}
static void load() {
while (cylinder[0]) {
rshift();
}
cylinder[0] = true;
rshift();
}
static void spin() {
int lim = nextInt(6) + 1;
int i;
for (i = 1; i < lim; i++) {
rshift();
}
}
static bool fire() {
bool shot = cylinder[0];
rshift();
return shot;
}
static int method(const char *s) {
unload();
for (; *s != '\0'; s++) {
switch (*s) {
case 'L':
load();
break;
case 'S':
spin();
break;
case 'F':
if (fire()) {
return 1;
}
break;
}
}
return 0;
}
static void append(char *out, const char *txt) {
if (*out != '\0') {
strcat(out, ", ");
}
strcat(out, txt);
}
static void mstring(const char *s, char *out) {
for (; *s != '\0'; s++) {
switch (*s) {
case 'L':
append(out, "load");
break;
case 'S':
append(out, "spin");
break;
case 'F':
append(out, "fire");
break;
}
}
}
static void test(char *src) {
char buffer[41] = "";
const int tests = 100000;
int sum = 0;
int t;
double pc;
for (t = 0; t < tests; t++) {
sum += method(src);
}
mstring(src, buffer);
pc = 100.0 * sum / tests;
printf("%-40s produces %6.3f%% deaths.\n", buffer, pc);
}
int main() {
srand(time(0));
test("LSLSFSF");
test("LSLSFF");
test("LLSFSF");
test("LLSFF");
return 0;
}</syntaxhighlight>
{{out}}
<pre>load, spin, load, spin, fire, spin, fire produces 55.456% deaths.
load, spin, load, spin, fire, fire produces 58.301% deaths.
load, load, spin, fire, spin, fire produces 55.487% deaths.
load, load, spin, fire, fire produces 50.289% deaths.</pre>
=={{header|C++}}==
{{trans|C}}
<syntaxhighlight lang="cpp">#include <array>
#include <iomanip>
#include <iostream>
#include <random>
#include <sstream>
class Roulette {
private:
std::array<bool, 6> cylinder;
std::mt19937 gen;
std::uniform_int_distribution<> distrib;
int next_int() {
return distrib(gen);
}
void rshift() {
std::rotate(cylinder.begin(), cylinder.begin() + 1, cylinder.end());
}
void unload() {
std::fill(cylinder.begin(), cylinder.end(), false);
}
void load() {
while (cylinder[0]) {
rshift();
}
cylinder[0] = true;
rshift();
}
void spin() {
int lim = next_int();
for (int i = 1; i < lim; i++) {
rshift();
}
}
bool fire() {
auto shot = cylinder[0];
rshift();
return shot;
}
public:
Roulette() {
std::random_device rd;
gen = std::mt19937(rd());
distrib = std::uniform_int_distribution<>(1, 6);
unload();
}
int method(const std::string &s) {
unload();
for (auto c : s) {
switch (c) {
case 'L':
load();
break;
case 'S':
spin();
break;
case 'F':
if (fire()) {
return 1;
}
break;
}
}
return 0;
}
};
std::string mstring(const std::string &s) {
std::stringstream ss;
bool first = true;
auto append = [&ss, &first](const std::string s) {
if (first) {
first = false;
} else {
ss << ", ";
}
ss << s;
};
for (auto c : s) {
switch (c) {
case 'L':
append("load");
break;
case 'S':
append("spin");
break;
case 'F':
append("fire");
break;
}
}
return ss.str();
}
void test(const std::string &src) {
const int tests = 100000;
int sum = 0;
Roulette r;
for (int t = 0; t < tests; t++) {
sum += r.method(src);
}
double pc = 100.0 * sum / tests;
std::cout << std::left << std::setw(40) << mstring(src) << " produces " << pc << "% deaths.\n";
}
int main() {
test("LSLSFSF");
test("LSLSFF");
test("LLSFSF");
test("LLSFF");
return 0;
}</syntaxhighlight>
{{out}}
<pre>load, spin, load, spin, fire, spin, fire produces 55.487% deaths.
load, spin, load, spin, fire, fire produces 58.542% deaths.
load, load, spin, fire, spin, fire produces 55.675% deaths.
load, load, spin, fire, fire produces 50.051% deaths.</pre>
=={{header|EasyLang}}==
{{trans|C}}
<syntaxhighlight>
len cyl[] 6
proc rshift . .
h = cyl[6]
for i = 6 downto 2
cyl[i] = cyl[i - 1]
.
cyl[1] = h
.
proc unload . .
for i = 1 to 6
cyl[i] = 0
.
.
proc load . .
while cyl[1] = 1
rshift
.
cyl[1] = 1
rshift
.
proc spin . .
lim = randint 6
for i = 1 to lim - 1
rshift
.
.
func fire .
shot = cyl[1]
rshift
return shot
.
func method m[] .
unload
for m in m[]
if m = 1
load
elif m = 2
spin
elif m = 3
if fire = 1
return 1
.
.
.
return 0
.
method$[] = [ "load" "spin" "fire" ]
proc test m[] . .
n = 100000
for i = 1 to n
sum += method m[]
.
for i = 1 to len m[]
write method$[m[i]] & " "
.
print "-> " & 100 * sum / n & "% death"
.
test [ 1 2 1 2 3 2 3 ]
test [ 1 2 1 2 3 3 ]
test [ 1 1 2 3 2 3 ]
test [ 1 1 2 3 3 ]
</syntaxhighlight>
=={{header|Factor}}==
{{trans|Julia}}
{{trans|Python}}
<syntaxhighlight lang="factor">USING: accessors assocs circular formatting fry kernel literals
math random sequences ;
IN: rosetta-code.roulette
CONSTANT: cyl $[ { f f f f f f } <circular> ]
: cylinder ( -- seq ) cyl [ drop f ] map! ;
: load ( seq -- seq' )
0 over nth [ dup rotate-circular ] when
t 0 rot [ set-nth ] [ rotate-circular ] [ ] tri ;
: spin ( seq -- seq' ) [ 6 random 1 + + ] change-start ;
: fire ( seq -- ? seq' )
[ 0 swap nth ] [ rotate-circular ] [ ] tri ;
: LSLSFSF ( -- ? ) cylinder load spin load spin fire spin fire drop or ;
: LSLSFF ( -- ? ) cylinder load spin load spin fire fire drop or ;
: LLSFSF ( -- ? ) cylinder load load spin fire spin fire drop or ;
: LLSFF ( -- ? ) cylinder load load spin fire fire drop or ;
: percent ( ... n quot: ( ... -- ... ? ) -- ... x )
0 -rot '[ _ call( -- ? ) 1 0 ? + ] [ times ] keepd /f 100 * ; inline
: run-test ( description quot -- )
100,000 swap percent
"Method <%s> produces %.3f%% deaths.\n" printf ;
: main ( -- )
{
{ "load, spin, load, spin, fire, spin, fire" [ LSLSFSF ] }
{ "load, spin, load, spin, fire, fire" [ LSLSFF ] }
{ "load, load, spin, fire, spin, fire" [ LLSFSF ] }
{ "load, load, spin, fire, fire" [ LLSFF ] }
} [ run-test ] assoc-each ;
MAIN: main</syntaxhighlight>
{{out}}
<pre>"rosetta-code.roulette" run</pre>
<pre>
Method <load, spin, load, spin, fire, spin, fire> produces 55.598% deaths.
Method <load, spin, load, spin, fire, fire> produces 58.390% deaths.
Method <load, load, spin, fire, spin, fire> produces 55.500% deaths.
Method <load, load, spin, fire, fire> produces 49.841% deaths.
</pre>
=={{header|FreeBASIC}}==
{{trans|Wren}}
<syntaxhighlight lang="vbnet">Type Revolver
cylinder(0 To 5) As Integer
End Type
Sub rshift(r As Revolver)
Dim t As Integer = r.cylinder(5)
For i As Integer = 4 To 0 Step -1
r.cylinder(i + 1) = r.cylinder(i)
Next i
r.cylinder(0) = t
End Sub
Sub unload(r As Revolver)
For i As Integer = 0 To 5
r.cylinder(i) = 0
Next i
End Sub
Sub load(r As Revolver)
While r.cylinder(0) <> 0
rshift(r)
Wend
r.cylinder(0) = -1
rshift(r)
End Sub
Sub spin(r As Revolver)
For i As Integer = 1 To Int(Rnd * 6) + 1
rshift(r)
Next i
End Sub
Function fire(r As Revolver) As Integer
Dim As Integer shot = r.cylinder(0)
rshift(r)
Return shot
End Function
Function method(r As Revolver, s As String) As Integer
unload(r)
For i As Integer = 1 To Len(s)
Dim c As String = Mid(s, i, 1)
If c = "L" Then
load(r)
Elseif c = "S" Then
spin(r)
Elseif c = "F" Then
If fire(r) <> 0 Then Return 1
End If
Next i
Return 0
End Function
Function mstring(s As String) As String
Dim As String l = ""
For i As Integer = 1 To Len(s)
Dim As String c = Mid(s, i, 1)
If c = "L" Then
l &= "load, "
Elseif c = "S" Then
l &= "spin, "
Elseif c = "F" Then
l &= "fire, "
End If
Next i
Return Left(l, Len(l) - 2)
End Function
Dim As Revolver rev
Dim As Integer tests = 100000
Dim As String methods(0 To 3) = {"LSLSFSF", "LSLSFF", "LLSFSF", "LLSFF"}
For m As Integer = 0 To 3 'In methods
Dim sum As Integer = 0
For t As Integer = 1 To tests
sum += method(rev, methods(m))
Next t
Print mstring(methods(m)), " produces "; sum * 100.0 / tests; "% deaths."
Next m
Sleep</syntaxhighlight>
{{out}}
<pre>load, spin, load, spin, fire, spin, fire produces 55.385% deaths.
load, spin, load, spin, fire, fire produces 58.204% deaths.
load, load, spin, fire, spin, fire produces 55.372% deaths.
load, load, spin, fire, fire produces 50.052% deaths.</pre>
=={{header|Go}}==
{{trans|Wren}}
Though procedural rather than OO.
<syntaxhighlight lang="go">package main
import (
"fmt"
"math/rand"
"strings"
"time"
)
var cylinder = [6]bool{}
func rshift() {
t := cylinder[5]
for i := 4; i >= 0; i-- {
cylinder[i+1] = cylinder[i]
}
cylinder[0] = t
}
func unload() {
for i := 0; i < 6; i++ {
cylinder[i] = false
}
}
func load() {
for cylinder[0] {
rshift()
}
cylinder[0] = true
rshift()
}
func spin() {
var lim = 1 + rand.Intn(6)
for i := 1; i < lim; i++ {
rshift()
}
}
func fire() bool {
shot := cylinder[0]
rshift()
return shot
}
func method(s string) int {
unload()
for _, c := range s {
switch c {
case 'L':
load()
case 'S':
spin()
case 'F':
if fire() {
return 1
}
}
}
return 0
}
func mstring(s string) string {
var l []string
for _, c := range s {
switch c {
case 'L':
l = append(l, "load")
case 'S':
l = append(l, "spin")
case 'F':
l = append(l, "fire")
}
}
return strings.Join(l, ", ")
}
func main() {
rand.Seed(time.Now().UnixNano())
tests := 100000
for _, m := range []string{"LSLSFSF", "LSLSFF", "LLSFSF", "LLSFF"} {
sum := 0
for t := 1; t <= tests; t++ {
sum += method(m)
}
pc := float64(sum) * 100 / float64(tests)
fmt.Printf("%-40s produces %6.3f%% deaths.\n", mstring(m), pc)
}
}</syntaxhighlight>
{{out}}
Sample run:
<pre>
load, spin, load, spin, fire, spin, fire produces 55.267% deaths.
load, spin, load, spin, fire, fire produces 58.110% deaths.
load, load, spin, fire, spin, fire produces 55.405% deaths.
load, load, spin, fire, fire produces 49.889% deaths.
</pre>
=={{header|Java}}==
<syntaxhighlight lang="java">
import java.util.BitSet;
import java.util.concurrent.ThreadLocalRandom;
public class TwoBulletRoulette {
public static void main(String[] aArgs) {
Revolver handgun = new Revolver();
final int simulationCount = 100_000;
for ( Situation situation : Situation.values() ) {
double deaths = 0.0;
for ( int i = 0; i < simulationCount; i++ ) {
ResultState resultState = handgun.operateInMode(situation);
if ( resultState == ResultState.DEAD) {
deaths += 1.0;
}
}
final double deathRate = ( deaths / simulationCount ) * 100;
String percentage = String.format("%4.1f%%", deathRate);
System.out.println("Situation " + situation + " produces " + percentage + " deaths");
}
}
}
enum Situation { A, B, C, D }
enum ResultState { ALIVE, DEAD }
/**
* Representation of a six cylinder revolving chamber pistol.
*/
class Revolver {
public Revolver() {
chambers = new BitSet(chamberCount);
random = ThreadLocalRandom.current();
}
public ResultState operateInMode(Situation aSituation) {
return switch ( aSituation ) {
case A -> useSituationA();
case B -> useSituationB();
case C -> useSituationC();
case D -> useSituationD();
};
}
// PRIVATE //
private void unload() {
chambers.clear();
}
private void load() {
while ( chambers.get(loadingChamber) ) {
rotateClockwise();
}
chambers.set(loadingChamber);
rotateClockwise();
}
private void spin() {
final int spins = random.nextInt(0, chamberCount);
for ( int i = 0; i < spins; i++ ) {
rotateClockwise();
}
}
private boolean fire() {
boolean fire = chambers.get(firingChamber);
chambers.set(firingChamber, false);
rotateClockwise();
return fire;
}
private void rotateClockwise() {
final boolean temp = chambers.get(chamberCount - 1);
for ( int i = chamberCount - 2; i >= 0; i-- ) {
chambers.set(i + 1, chambers.get(i));
}
chambers.set(firingChamber, temp);
}
private ResultState useSituationA() {
unload();
load();
spin();
load();
spin();
if ( fire() ) {
return ResultState.DEAD;
};
spin();
if ( fire() ) {
return ResultState.DEAD;
};
return ResultState.ALIVE;
}
private ResultState useSituationB() {
unload();
load();
spin();
load();
spin();
if ( fire() ) {
return ResultState.DEAD;
};
if ( fire() ) {
return ResultState.DEAD;
};
return ResultState.ALIVE;
}
private ResultState useSituationC() {
unload();
load();
load();
spin();
if ( fire() ) {
return ResultState.DEAD;
};
spin();
if ( fire() ) {
return ResultState.DEAD;
};
return ResultState.ALIVE;
}
private ResultState useSituationD() {
unload();
load();
load();
spin();
if ( fire() ) {
return ResultState.DEAD;
};
if ( fire() ) {
return ResultState.DEAD;
};
return ResultState.ALIVE;
}
private BitSet chambers;
private ThreadLocalRandom random;
private final int firingChamber = 0;
private final int loadingChamber = 1;
private final int chamberCount = 6;
}
</syntaxhighlight>
{{ out }}
<pre>
Situation A produces 55.6% deaths
Situation B produces 58.2% deaths
Situation C produces 55.7% deaths
Situation D produces 49.7% deaths
</pre>
=={{header|JavaScript}}==
<syntaxhighlight lang="javascript">
let Pistol = function(method) {
this.fired = false;
this.cylinder = new Array(6).fill(false);
this.trigger = 0;
this.rshift = function() {
this.trigger = this.trigger == 0 ? 5 : this.trigger-1;
}
this.load = function() {
while (this.cylinder[this.trigger]) this.rshift();
this.cylinder[this.trigger] = true;
this.rshift();
}
// actually we don't need this here: just for completeness
this.unload = function() { this.cylinder.fill(false); }
this.spin = function() { this.trigger = Math.floor(Math.random() * 6); }
this.fire = function() {
if (this.cylinder[this.trigger]) this.fired = true;
this.rshift();
}
this.exec = function() {
if (!method) console.error('No method provided');
else {
method = method.toUpperCase();
for (let x = 0; x < method.length; x++)
switch (method[x]) {
case 'F' : this.fire(); break;
case 'L' : this.load(); break;
case 'S' : this.spin(); break;
case 'U' : this.unload(); break;
default: console.error(`Unknown character in method: ${method[x]}`);
}
return this.fired;
}
}
}
// simulating
const ITERATIONS = 25e4;
let methods = 'lslsfsf lslsff llsfsf llsff'.split(' '),
bodyCount;
console.log(`@ ${ITERATIONS.toLocaleString('en')} iterations:`);
console.log();
for (let x = 0; x < methods.length; x++) {
bodyCount = 0;
for (let y = 1; y <= ITERATIONS; y++)
if (new Pistol(methods[x]).exec()) bodyCount++;
console.log(`${methods[x]}:`);
console.log(`deaths: ${bodyCount.toLocaleString('en')} (${(bodyCount / ITERATIONS * 100).toPrecision(3)} %) `);
console.log();
}
</syntaxhighlight>
{{out}}
Example:
<pre>
@ 250,000 iterations:
lslsfsf:
deaths: 139,030 (55.6 %)
lslsff:
deaths: 145,912 (58.4 %)
llsfsf:
deaths: 138,628 (55.5 %)
llsff:
deaths: 125,268 (50.1 %)
</pre>
=={{header|Julia}}==
{{trans|Python}}
<syntaxhighlight lang="julia">const cyl = zeros(Bool, 6)
function load()
while cyl[1]
cyl .= circshift(cyl, 1)
end
cyl[1] = true
cyl .= circshift(cyl, 1)
end
spin() = (cyl .= circshift(cyl, rand(1:6)))
fire() = (shot = cyl[1]; cyl .= circshift(cyl, 1); shot)
function LSLSFSF()
cyl .= 0
load(); spin(); load(); spin()
fire() && return true
spin(); return fire()
end
function LSLSFF()
cyl .= 0
load(); spin(); load(); spin()
fire() && return true
return fire()
end
function LLSFSF()
cyl .= 0
load(); load(); spin()
fire() && return true
spin(); return fire()
end
function LLSFF()
cyl .= 0
load(); load(); spin()
fire() && return true
return fire()
end
function testmethods(N = 10000000)
for (name, method) in [("load, spin, load, spin, fire, spin, fire", LSLSFSF),
("load, spin, load, spin, fire, fire", LSLSFF),
("load, load, spin, fire, spin, fire", LLSFSF),
("load, load, spin, fire, fire", LLSFF)]
percentage = 100 * sum([method() for _ in 1:N]) / N
println("Method $name produces $percentage per cent deaths.")
end
end
testmethods()
</syntaxhighlight>{{out}}
<pre>
Method load, spin, load, spin, fire, spin, fire produces 55.54253 per cent deaths.
Method load, spin, load, spin, fire, fire produces 58.32598 per cent deaths.
Method load, load, spin, fire, spin, fire produces 55.54244 per cent deaths.
Method load, load, spin, fire, fire produces 50.02247 per cent deaths.
</pre>
=={{header|Kotlin}}==
{{trans|C}}
<syntaxhighlight lang="scala">import kotlin.random.Random
val cylinder = Array(6) { false }
fun rShift() {
val t = cylinder[cylinder.size - 1]
for (i in (0 until cylinder.size - 1).reversed()) {
cylinder[i + 1] = cylinder[i]
}
cylinder[0] = t
}
fun unload() {
for (i in cylinder.indices) {
cylinder[i] = false
}
}
fun load() {
while (cylinder[0]) {
rShift()
}
cylinder[0] = true
rShift()
}
fun spin() {
val lim = Random.nextInt(0, 6) + 1
for (i in 1..lim) {
rShift()
}
}
fun fire(): Boolean {
val shot = cylinder[0]
rShift()
return shot
}
fun method(s: String): Int {
unload()
for (c in s) {
when (c) {
'L' -> {
load()
}
'S' -> {
spin()
}
'F' -> {
if (fire()) {
return 1
}
}
}
}
return 0
}
fun mString(s: String): String {
val buf = StringBuilder()
fun append(txt: String) {
if (buf.isNotEmpty()) {
buf.append(", ")
}
buf.append(txt)
}
for (c in s) {
when (c) {
'L' -> {
append("load")
}
'S' -> {
append("spin")
}
'F' -> {
append("fire")
}
}
}
return buf.toString()
}
fun test(src: String) {
val tests = 100000
var sum = 0
for (t in 0..tests) {
sum += method(src)
}
val str = mString(src)
val pc = 100.0 * sum / tests
println("%-40s produces %6.3f%% deaths.".format(str, pc))
}
fun main() {
test("LSLSFSF");
test("LSLSFF");
test("LLSFSF");
test("LLSFF");
}</syntaxhighlight>
{{out}}
<pre>load, spin, load, spin, fire, spin, fire produces 55.638% deaths.
load, spin, load, spin, fire, fire produces 58.140% deaths.
load, load, spin, fire, spin, fire produces 55.725% deaths.
load, load, spin, fire, fire produces 49.875% deaths.</pre>
=={{header|Mathematica}}/{{header|Wolfram Language}}==
<syntaxhighlight lang="mathematica">ClearAll[Unload, Load, Spin, Fire]
Unload[] := ConstantArray[False, 6]
Load[state_List] := Module[{s = state},
While[s[[2]],
s = RotateRight[s, 1]
];
s[[2]] = True;
s
]
Spin[state_List] := RotateRight[state, RandomInteger[{1, 6}]]
Fire[state_List] := Module[{shot},
shot = First[state];
{RotateRight[state, 1], shot}
]
ClearAll[LSLSFSF]
LSLSFSF[] := Module[{state, shot},
state = Unload[];
state = Load[state];
state = Spin[state];
state = Load[state];
state = Spin[state];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
state = Spin[state];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
Return[False]
]
ClearAll[LSLSFF]
LSLSFF[] := Module[{state, shot},
state = Unload[];
state = Load[state];
state = Spin[state];
state = Load[state];
state = Spin[state];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
Return[False]
]
ClearAll[LLSFSF]
LLSFSF[] := Module[{state, shot},
state = Unload[];
state = Load[state];
state = Load[state];
state = Spin[state];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
state = Spin[state];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
Return[False]
]
ClearAll[LLSFF]
LLSFF[] := Module[{state, shot},
state = Unload[];
state = Load[state];
state = Load[state];
state = Spin[state];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
{state, shot} = Fire[state];
If[shot,
Return[True]
];
Return[False]
]
n = 10^5;
Count[Table[LSLSFSF[], n], True]/N[n]
Count[Table[LSLSFF[], n], True]/N[n]
Count[Table[LLSFSF[], n], True]/N[n]
Count[Table[LLSFF[], n], True]/N[n]</syntaxhighlight>
{{out}}
<pre>0.55243
0.58272
0.55423
0.49975</pre>
=={{header|Nim}}==
<syntaxhighlight lang="nim">import algorithm, random, sequtils, strformat, strutils, tables
type
Revolver = array[6, bool]
Action {.pure.} = enum Load, Spin, Fire, Error
const Actions = {'L': Load, 'S': Spin, 'F': Fire}.toTable
func spin(revolver: var Revolver; count: Positive) =
revolver.rotateLeft(-count)
func load(revolver: var Revolver) =
while revolver[1]:
revolver.spin(1)
revolver[1] = true
revolver.spin(1)
func fire(revolver: var Revolver): bool =
result = revolver[0]
revolver.spin(1)
proc test(scenario: string) =
let actions = scenario.mapIt(Actions.getOrDefault(it, Error))
var deaths = 0
var count = 100_000
for _ in 1..count:
var revolver: Revolver
for action in actions:
case action
of Load:
revolver.load()
of Spin:
revolver.spin(rand(1..6))
of Fire:
if revolver.fire():
inc deaths
break
of Error:
raise newException(ValueError, "encountered an unknown action.")
echo &"""{100 * deaths / count:5.2f}% deaths for scenario {actions.join(", ")}."""
randomize()
for scenario in ["LSLSFSF", "LSLSFF", "LLSFSF", "LLSFF"]:
test(scenario)</syntaxhighlight>
{{out}}
<pre>55.73% deaths for scenario Load, Spin, Load, Spin, Fire, Spin, Fire.
58.09% deaths for scenario Load, Spin, Load, Spin, Fire, Fire.
55.74% deaths for scenario Load, Load, Spin, Fire, Spin, Fire.
50.14% deaths for scenario Load, Load, Spin, Fire, Fire.</pre>
=={{header|Odin}}==
<syntaxhighlight lang="Go">
/* imports */
import "core:fmt"
import "core:strings"
import "core:math/rand"
/* globals */
cylinder := [6]bool{}
/* main block */
main :: proc() {
rand.set_global_seed(42)
tests := 100000
sequence := [?]string{"LSLSFSF", "LSLSFF", "LLSFSF", "LLSFF"}
for m in sequence {
sum := 0
for t in 0 ..< tests {
sum += method(m)
}
pc: f64 = cast(f64)sum * 100 / cast(f64)tests
fmt.printf("%-40s produces %6.3f%% deaths.\n", mstring(m), pc)
}
}
/* definitions */
rshift :: proc() {
t := cylinder[len(cylinder) - 1]
copy(cylinder[1:], cylinder[0:])
cylinder[0] = t
}
unload :: proc() {
cylinder = false // array programming
}
load :: proc() {
for cylinder[0] {
rshift()
}
cylinder[0] = true
rshift()
}
spin :: proc() {
data: []int = {1, 2, 3, 4, 5, 6}
lim := rand.choice(data[:])
for i in 0 ..< lim {
rshift()
}
}
fire :: proc() -> bool {
shot := cylinder[0]
rshift()
return shot
}
method :: proc(s: string) -> int {
unload()
for character in s {
switch character {
case 'L':
load()
case 'S':
spin()
case 'F':
if fire() {
return 1
}
}
}
return 0
}
mstring :: proc(s: string) -> string {
l: [dynamic]string
for character in s {
switch character {
case 'L':
append(&l, "load")
case 'S':
append(&l, "spin")
case 'F':
append(&l, "fire")
}
}
return strings.join(l[:], ", ")
}
</syntaxhighlight>
{{out}}
<pre>
load, spin, load, spin, fire, spin, fire produces 55.771% deaths.
load, spin, load, spin, fire, fire produces 58.313% deaths.
load, load, spin, fire, spin, fire produces 55.487% deaths.
load, load, spin, fire, fire produces 49.972% deaths.
</pre>
=={{header|Perl}}==
{{trans|Raku}}
<syntaxhighlight lang="perl">use strict;
use warnings;
use feature 'say';
my @cyl;
my $shots = 6;
sub load {
push @cyl, shift @cyl while $cyl[1];
$cyl[1] = 1;
push @cyl, shift @cyl
}
sub spin { push @cyl, shift @cyl for 0 .. int rand @cyl }
sub fire { push @cyl, shift @cyl; $cyl[0] }
sub LSLSFSF {
@cyl = (0) x $shots;
load, spin, load, spin;
return 1 if fire;
spin;
fire
}
sub LSLSFF {
@cyl = (0) x $shots;
load, spin, load, spin;
fire or fire
}
sub LLSFSF {
@cyl = (0) x $shots;
load, load, spin;
return 1 if fire;
spin;
fire
}
sub LLSFF {
@cyl = (0) x $shots;
load, load, spin;
fire or fire
}
my $trials = 10000;
for my $ref (<LSLSFSF LSLSFF LLSFSF LLSFF>) {
no strict 'refs';
my $total = 0;
$total += &$ref for 1..$trials;
printf "%7s %.2f%%\n", $ref, $total / $trials * 100;
}</syntaxhighlight>
{{out}}
<pre>LSLSFSF 55.04%
LSLSFF 58.77%
LLSFSF 55.09%
LLSFF 50.13%</pre>
=={{header|Phix}}==
<!--<syntaxhighlight lang="phix">(phixonline)-->
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">spin</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">count</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">while</span> <span style="color: #000000;">count</span> <span style="color: #008080;">do</span>
<span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">revolver</span><span style="color: #0000FF;">[$]&</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..$-</span><span style="color: #000000;">1</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;">while</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">revolver</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">load</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">revolver</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">while</span> <span style="color: #000000;">revolver</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">do</span>
<span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">spin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #000000;">revolver</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">true</span>
<span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">spin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">revolver</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">fire</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">bool</span> <span style="color: #000000;">dead</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">revolver</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span> <span style="color: #000000;">dead</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">true</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">spin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #000000;">dead</span><span style="color: #0000FF;">}</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">procedure</span> <span style="color: #000000;">test</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">me</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">{</span><span style="color: #004080;">string</span> <span style="color: #000000;">method</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">expected</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">me</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">deaths</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">limit</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">100_000</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">n</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">limit</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #004600;">false</span><span style="color: #0000FF;">,</span><span style="color: #000000;">6</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">bool</span> <span style="color: #000000;">dead</span> <span style="color: #0000FF;">=</span> <span style="color: #004600;">false</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;">method</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">ch</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">method</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
<span style="color: #008080;">switch</span> <span style="color: #000000;">ch</span>
<span style="color: #008080;">case</span> <span style="color: #008000;">'L'</span><span style="color: #0000FF;">:</span> <span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">load</span><span style="color: #0000FF;">(</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">case</span> <span style="color: #008000;">'S'</span><span style="color: #0000FF;">:</span> <span style="color: #000000;">revolver</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">spin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">rand</span><span style="color: #0000FF;">(</span><span style="color: #000000;">6</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">case</span> <span style="color: #008000;">'F'</span><span style="color: #0000FF;">:</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #000000;">dead</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">fire</span><span style="color: #0000FF;">(</span><span style="color: #000000;">revolver</span><span style="color: #0000FF;">,</span><span style="color: #000000;">dead</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">switch</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #000000;">deaths</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">dead</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;">"%s: %5.2f (expected %.2f%%)\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">method</span><span style="color: #0000FF;">,</span><span style="color: #000000;">100</span><span style="color: #0000FF;">*</span><span style="color: #000000;">deaths</span><span style="color: #0000FF;">/</span><span style="color: #000000;">limit</span><span style="color: #0000FF;">,</span><span style="color: #000000;">expected</span><span style="color: #0000FF;">*</span><span style="color: #000000;">100</span><span style="color: #0000FF;">})</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</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;">"Load/Spin/Fire method percentage fatalities:\n"</span><span style="color: #0000FF;">)</span>
<span style="color: #7060A8;">papply</span><span style="color: #0000FF;">({{</span><span style="color: #008000;">"LSLSFSF"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">/</span><span style="color: #000000;">9</span><span style="color: #0000FF;">},{</span><span style="color: #008000;">"LSLSFF"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">/</span><span style="color: #000000;">12</span><span style="color: #0000FF;">},{</span><span style="color: #008000;">"LLSFSF"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">/</span><span style="color: #000000;">9</span><span style="color: #0000FF;">},{</span><span style="color: #008000;">"LLSFF"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">}},</span><span style="color: #000000;">test</span><span style="color: #0000FF;">)</span>
<!--</syntaxhighlight>-->
{{out}}
<pre>
Load/Spin/Fire method percentage fatalities:
LSLSFSF: 55.40 (expected 55.56%)
LSLSFF: 58.33 (expected 58.33%)
LLSFSF: 55.54 (expected 55.56%)
LLSFF: 50.03 (expected 50.00%)
</pre>
=={{header|Python}}==
<
import numpy as np
Line 76 ⟶ 1,552:
def fire(self):
""" pull trigger of revolver, return True if fired, False if did not fire """
shot = self.cylinder[
self.cylinder[:] = np.roll(self.cylinder, 1)
return shot
Line 144 ⟶ 1,620:
percentage = 100 * sum([method() for _ in range(TESTCOUNT)]) / TESTCOUNT
print("Method", name, "produces", percentage, "per cent deaths.")
</
<pre>
Method load, spin, load, spin, fire, spin, fire produces 55.652 per cent deaths.
Line 150 ⟶ 1,626:
Method load, load, spin, fire, spin, fire produces 55.774 per cent deaths.
Method load, load, spin, fire, fire produces 50.071 per cent deaths.
</pre>
=={{header|Raku}}==
<syntaxhighlight lang="raku" line>unit sub MAIN ($shots = 6);
my @cyl;
sub load () {
@cyl.=rotate(-1) while @cyl[1];
@cyl[1] = 1;
@cyl.=rotate(-1);
}
sub spin () { @cyl.=rotate: (^@cyl).pick }
sub fire () { @cyl.=rotate; @cyl[0] }
sub LSLSFSF {
@cyl = 0 xx $shots;
load, spin, load, spin;
return 1 if fire;
spin;
fire
}
sub LSLSFF {
@cyl = 0 xx $shots;
load, spin, load, spin;
fire() || fire
}
sub LLSFSF {
@cyl = 0 xx $shots;
load, load, spin;
return 1 if fire;
spin;
fire
}
sub LLSFF {
@cyl = 0 xx $shots;
load, load, spin;
fire() || fire
}
my %revolver;
my $trials = 100000;
for ^$trials {
%revolver<LSLSFSF> += LSLSFSF;
%revolver<LSLSFF> += LSLSFF;
%revolver<LLSFSF> += LLSFSF;
%revolver<LLSFF> += LLSFF;
}
say "{.fmt('%7s')}: %{(%revolver{$_} / $trials × 100).fmt('%.2f')}"
for <LSLSFSF LSLSFF LLSFSF LLSFF></syntaxhighlight>
{{out|Sample output (default; 6 shooter)}}
<pre>LSLSFSF: %55.37
LSLSFF: %58.30
LLSFSF: %55.42
LLSFF: %50.29
</pre>
Though if you go and look at the [[wp:Nagant_M1895| Wikipedia article for the 1895 Nagant revolver]] mentioned in the task reference section, you'll see it is actually a <u>'''7'''</u> shot revolver... so, run again with 7 chambers:
<code>raku roulette.raku 7</code>
{{out|Sample output (7 shooter)}}
<pre>LSLSFSF: %49.29
LSLSFF: %51.14
LLSFSF: %48.74
LLSFF: %43.08</pre>
Or, how about a [[wp:Ruger_GP100#Specifications|Ruger GP100 10 round revolver]]?
<code>raku roulette.raku 10</code>
{{out|Sample output (10 shooter)}}
<pre>LSLSFSF: %36.00
LSLSFF: %37.00
LLSFSF: %36.13
LLSFF: %29.77</pre>
Doesn't change the answers, B (LSLSFF) is definitely the <strike>worst</strike> most likely choice in all cases.
=={{header|REXX}}==
{{trans|GO}}
This REXX version eliminates the spinning of the bullet chamber if the random number for a spin is '''6''' (which would
<br>normally just spin the bullet chamber around to its initial position, thereby saving some busywork by the program).
Changing the cartridge chamber from an index array to a simple string made the program around '''200%''' faster.
<syntaxhighlight lang="rexx">/*REXX pgm simulates scenarios for a two─bullet Russian roulette game with a 6 cyl. gun.*/
parse arg cyls tests seed . /*obtain optional arguments from the CL*/
if cyls=='' | cyls=="," then cyls= 6 /*Not specified? Then use the default.*/
if tests=='' | tests=="," then tests= 100000 /* " " " " " " */
if datatype(seed, 'W') then call random ,,seed /* " " " " " " */
cyls_ = cyls - 1; @0= copies(0, cyls) /*shortcut placeholder for cylinders-1 */
@abc= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' /*indices for the various options used.*/
scenarios= 'LSLSFsF LSLSFF LLSFSF LLSFF' /*the list of scenarios to be tested. */
#= words(scenarios) /*the number of actions in a scenario. */
/*The scenarios are case insensitive. */
do m=1 for #; q= word(scenarios, m) /*test each of the scenarios specified.*/
sum= 0 /*initialize the sum to zero. */
do tests; sum= sum + method() /*added the sums up for the percentages*/
end /*tests*/
pc= left( (sum * 100 / tests)"%", 7)
say act() ' (option' substr(@abc, m, 1)") produces " pc ' deaths.'
end /*m*/
exit 0 /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
fire: != left(@, 1); @= right(@, cyls_)left(@, 1); /* ◄──── next cyl.*/ return !
load: if left(@, 1) then @= right(@, cyls_)left(@, 1); @= 1||right(@, cyls_); return
spin: ?= random(1, cyls); if ?\==cyls then @= substr(@ || @, ? + 1, cyls); return
/*──────────────────────────────────────────────────────────────────────────────────────*/
method: @= @0; do a=1 for length(q); y= substr(q, a, 1)
if y=='L' then call load
else if y=='S' then call spin
else if y=='F' then if fire() then return 1
end /*a*/; return 0
/*──────────────────────────────────────────────────────────────────────────────────────*/
act: $=; do a=1 for length(q); y= substr(q, a, 1)
if y=='L' then $= $", load"
if y=='S' then $= $", spin"
if y=='F' then $= $", fire"
end /*a*/; return right( strip( strip($, , ",") ), 45)</syntaxhighlight>
{{out|output|text= when using the default inputs, showing that 2<sup>nd</sup> option '''B''' has the highest probability for a suicide:}}
<pre>
load, spin, load, spin, fire, spin, fire (option A) produces 55.44% deaths.
load, spin, load, spin, fire, fire (option B) produces 58.487% deaths.
load, load, spin, fire, spin, fire (option C) produces 55.82% deaths.
load, load, spin, fire, fire (option D) produces 50.021% deaths.
</pre>
=={{header|Ruby}}==
Out of morbid interest I added strategy E: load, spin, shoot, load, spin, shoot.
<syntaxhighlight lang="ruby">class Revolver
attr_accessor :strategy
attr_reader :notches, :shot_count
def initialize(strategy = [:load, :spin, :shoot], num_chambers = 6) # default like Deer hunter
@chambers = Array.new(num_chambers) # by default 6 nils
@strategy = strategy
@notches, @shot_count, @loaded_count = 0, 0, 0
end
def load
raise "gun completely loaded " if @chambers.all? :loaded
@chambers.rotate! until @chambers[1] == nil #not sure about this; Raku rotates -1
@chambers[1] = :loaded
@chambers.rotate! #not sure about this; Raku rotates -1
@loaded_count += 1
end
def spin
@chambers.rotate!(rand(1..@chambers.size))
end
def unload
@chambers.fill(nil)
@loaded_count = 0
end
def shoot
@chambers[0] = nil
@chambers.rotate!
end
def play
strategy.each{|action| send(action)}
@shot_count += 1
@notches += 1 unless @chambers.count(:loaded) == @loaded_count # all bullets still there?
unload
end
end
strategies = {:A => [:load, :spin, :load, :spin, :shoot, :spin, :shoot],
:B => [:load, :spin, :load, :spin, :shoot, :shoot],
:C => [:load, :load, :spin, :shoot, :spin, :shoot],
:D => [:load, :load, :spin, :shoot, :shoot],
:E => [:load, :spin, :shoot, :load, :spin, :shoot]}
n = 100_000
puts "simulation of #{n} runs:"
strategies.each do |name, strategy|
gun = Revolver.new(strategy) # Revolver.new(strategy, 10) for a 10-shooter
n.times{gun.play}
puts "Strategy #{name}: #{gun.notches.fdiv(gun.shot_count)}"
end
</syntaxhighlight>
{{out}}
<pre>simulation of 100000 runs:
Strategy A: 0.55728
Strategy B: 0.58316
Strategy C: 0.5598
Strategy D: 0.49876
Strategy E: 0.44323
</pre>
=={{header|V (Vlang)}}==
{{trans|Kotlin}}
<syntaxhighlight lang="v (vlang)">
import rand
__global cylinder = []bool{len:6}
fn main() {
test("LSLSFSF")
test("LSLSFF")
test("LLSFSF")
test("LLSFF")
}
fn test(src string) {
tests := 100000
mut sum := 0
for _ in 0..tests {
sum += method(src)
}
println('${m_string(src)} produces ${100.0 * f32(sum) / f32(tests)}% deaths.')
}
fn rshift() {
t := cylinder[5]
for i := 4; i >= 0; i-- {
cylinder[i+1] = cylinder[i]
}
cylinder[0] = t
}
fn unload() {
for i := 0; i < 6; i++ {
cylinder[i] = false
}
}
fn load() {
for cylinder[0] {
rshift()
}
cylinder[0] = true
rshift()
}
fn spin() {
mut lim := 1 + rand.intn(6) or {exit(1)}
for i := 1; i < lim; i++ {
rshift()
}
}
fn fire() bool {
shot := cylinder[0]
rshift()
return shot
}
fn method(s string) int {
unload()
for c in s {
match c.ascii_str() {
'L' {load()}
'S' {spin()}
'F' {if fire() == true {return 1}}
else {}
}
}
return 0
}
fn m_string(s string) string {
mut l := []string{}
for c in s {
match c.ascii_str() {
'L' {l << "load"}
'S' {l << "spin"}
'F' {l << "fire"}
else {}
}
}
return l.join(', ')
}
</syntaxhighlight>
{{out}}
<pre>
load, spin, load, spin, fire, spin, fire produces 55.795% deaths.
load, spin, load, spin, fire, fire produces 58.453% deaths.
load, load, spin, fire, spin, fire produces 55.468% deaths.
load, load, spin, fire, fire produces 49.868% deaths.
</pre>
=={{header|Wren}}==
{{libheader|Wren-fmt}}
<syntaxhighlight lang="wren">import "random" for Random
import "./fmt" for Fmt
var Rand = Random.new()
class Revolver {
construct new() {
_cylinder = List.filled(6, false)
}
rshift() {
var t = _cylinder[-1]
for (i in 4..0) _cylinder[i+1] = _cylinder[i]
_cylinder[0] = t
}
unload() {
for (i in 0..5) _cylinder[i] = false
}
load() {
while (_cylinder[0]) rshift()
_cylinder[0] = true
rshift()
}
spin() {
for (i in 1..Rand.int(1, 7)) rshift()
}
fire() {
var shot = _cylinder[0]
rshift()
return shot
}
method(s) {
unload()
for (c in s) {
if (c == "L") {
load()
} else if (c == "S") {
spin()
} else if (c == "F") {
if (fire()) return 1
}
}
return 0
}
static mstring(s) {
var l = []
for (c in s) {
if (c == "L") {
l.add("load")
} else if (c == "S") {
l.add("spin")
} else if (c == "F") {
l.add("fire")
}
}
return l.join(", ")
}
}
var rev = Revolver.new()
var tests = 100000
for (m in ["LSLSFSF", "LSLSFF", "LLSFSF", "LLSFF"]) {
var sum = 0
for (t in 1..tests) sum = sum + rev.method(m)
Fmt.print("$-40s produces $6.3f\% deaths.", Revolver.mstring(m), sum * 100 / tests)
}</syntaxhighlight>
{{out}}
Sample run:
<pre>
load, spin, load, spin, fire, spin, fire produces 55.500% deaths.
load, spin, load, spin, fire, fire produces 58.162% deaths.
load, load, spin, fire, spin, fire produces 55.512% deaths.
load, load, spin, fire, fire produces 50.013% deaths.
</pre>
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