FizzBuzz/AWK: Difference between revisions
m
Fixed syntax highlighting.
(Remarks) |
m (Fixed syntax highlighting.) |
||
| (13 intermediate revisions by one other user not shown) | |||
Line 1:
{{collection|FizzBuzz}}
==
<!-- http://ideone.com/UrHdvd -->
This is the "traditional" approach:
Loop, and modulo-check to see what to print. <br>
Minor tweak: printf with no newline, and linebreaks only after each "FizzBuzz",
to get a more compact output.
<
#
BEGIN {
Line 24:
print "\n# Done."
}</
{{out}}
<pre>
Line 37:
# Done.
</pre>
When the output is presented like that, it is easy to see a pattern.
==
<!-- http://ideone.com/0VMIuO -->
Using echo from the shell to generate the numbers as input
Advantage: we need no loop inside the script.
Disadvantage: this needs a shell where echo can do this.
<
BEGIN {RS=" "}
$1 % 15 == 0 {print "FizzBuzz"; next}
Line 50 ⟶ 52:
$1 % 3 == 0 {printf "Fizz "; next}
{printf "%3d ",$1}
'</
==
Disadvantage: needs external command seq, i.e. this only works on unix.
(Also, hard to read)
<
===No divisions, using counters===
<!-- http://ideone.com/uHmYUr -->
Division is one of the more expensive operations,
so it is nice if we can avoid it.
All processing is done inside awk, using no division & no modulo. <br>
Instead, a simple counter for each of the output-variants is used:
<syntaxhighlight lang="awk"># usage: awk -v n=38 -f fizzbuzzNoDiv.awk
#
# FizzBuzz using no division & no modulo
BEGIN {
if(!n) n=100
Line 77 ⟶ 83:
}
print "\n# Done."
}</
Same output as version 1.
==
<!-- http://ideone.com/HJsrvl -->
Another solution
{{works with|gawk|4.1.0}} {{works with|mawk|1.3.3}}
This is inspired by the versions "Without Modulus" of Nimrod and Python, <br>
using a precomputed (observed:) pattern to decide how to print each number. <br>
But here, the pattern is represented as chars in a string,
instead of bits in an integer.
<syntaxhighlight lang="awk"># usage: awk -v n=42 -f fizzbuzzRepeatPattern.awk
#
if(
printf fb[
}
BEGIN {
Line 96 ⟶ 104:
print "# FizzBuzz:"
split("1,2, Fizz,4, Buzz, FizzBuzz\n,", fb, ",")
while (i<n) {
i++;
}
print "\n# Done."
}</
Same output as version 1.
===Custom FizzBuzz===
===Example program 1===
generated from [[General_FizzBuzz#AWK]],
for factors 2, 3, 5 using the words A, B, C. <br>
The list of numbers is also generated (much like in version 2 and 3),
and comes in as the file numbers.txt.
;Input:
<pre>31
2 A
3 B
5 C</pre>
<!-- http://ideone.com/yw1oEK -->
<syntaxhighlight lang="awk"># usage: awk -f fizzbuzzCustom.awk numbers.txt
#
BEGIN {print "# CustomFizzBuzz:"}
$1 % 2 == 0 {x = x "A"}
$1 % 3 == 0 {x = x "B"}
$1 % 5 == 0 {x = x "C"}
!x {print $1; next}
{print " ",x; x=""}
END {print "# Done."} </syntaxhighlight>
{{out}}
<pre># CustomFizzBuzz:
1
A
B
A
C
AB
7
A
B
AC
11
AB
13
A
BC
A
17
AB
19
AC
B
A
23
AB
C
A
B
A
29
ABC
31
# Done.</pre>
===Example program 2===
;Input: for the generator-program at [[General_FizzBuzz#AWK]]:
<pre>105
3 Fizz
5 Buzz
7 Baxx</pre>
<syntaxhighlight lang="awk">BEGIN {print "# CustomFizzBuzz:"}
$1 % 3 == 0 {x = x "Fizz"}
$1 % 5 == 0 {x = x "Buzz"}
$1 % 7 == 0 {x = x "Baxx"}
!x {print $1; next}
{print " ", x; x=""}
END {print "# Done."}</syntaxhighlight>
| |||