Permutations: Difference between revisions
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<pre>#(#(1 2 3) #(1 3 2) #(3 1 2) #(2 1 3) #(2 3 1) #(3 2 1))</pre>
=={{header|AWK}}==
<lang AWK>
# syntax: GAWK -f PERMUTATIONS.AWK [-v sep=x] [word]
#
# examples:
# REM all permutations on one line
# GAWK -f PERMUTATIONS.AWK
#
# REM all permutations on a separate line
# GAWK -f PERMUTATIONS.AWK -v sep="\n"
#
# REM use a different word
# GAWK -f PERMUTATIONS.AWK Gwen
#
# REM command used for RosettaCode output
# GAWK -f PERMUTATIONS.AWK -v sep="\n" Gwen
#
BEGIN {
sep = (sep == "") ? " " : substr(sep,1,1)
str = (ARGC == 1) ? "abc" : ARGV[1]
printf("%s%s",str,sep)
leng = length(str)
for (i=1; i<=leng; i++) {
arr[i-1] = substr(str,i,1)
}
ana_permute(0)
exit(0)
}
function ana_permute(pos, i,j,str) {
if (leng - pos < 2) { return }
for (i=pos; i<leng-1; i++) {
ana_permute(pos+1)
ana_rotate(pos)
for (j=0; j<=leng-1; j++) {
printf("%s",arr[j])
}
printf(sep)
}
ana_permute(pos+1)
ana_rotate(pos)
}
function ana_rotate(pos, c,i) {
c = arr[pos]
for (i=pos; i<leng-1; i++) {
arr[i] = arr[i+1]
}
arr[leng-1] = c
}
</lang>
<p>sample command:</p>
GAWK -f PERMUTATIONS.AWK Gwen
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<pre>
Gwen Gwne Genw Gewn Gnwe Gnew wenG weGn wnGe wneG wGen wGne enGw enwG eGwn eGnw ewnG ewGn nGwe nGew nweG nwGe neGw newG
</pre>
=={{header|Batch File}}==
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