It's not homework, I'm actually trying to build several strings with the combinations that will be used by a seperate input file. Anyway the following code accomplishes what I want (since my largest n will be 5) but this cannot be the best way to do it. I can't use the module option shown below since we are unable to install modules that are no available companywide. 
#!/usr/local/bin/perl-5.10.1 -w

use strict;

my $var = 5;
my @list = 1..$var;
my @combos;
foreach ( 0..($var-1) ){
    
    my @temp_array;
    
            push(@temp_array , "$list[$_]");
    if($list[$_+1]){push(@temp_array , "$list[$_]$list[$_+1]")}
    if($list[$_+2]){push(@temp_array , "$list[$_]$list[$_+1]$list[$_+2
+]")}
    if($list[$_+3]){push(@temp_array , "$list[$_]$list[$_+1]$list[$_+2
+]$list[$_+3]")}
    if($list[$_+4]){push(@temp_array , "$list[$_]$list[$_+1]$list[$_+2
+]$list[$_+3]$list[$_+4]")}
    
    push(@combos, @temp_array);

}

print "@combos\n";

[download]
prints: 1 12 123 1234 12345 2 23 234 2345 3 34 345 4 45 5

In reply to Re^2: All possible number combinations in perl by austinj
in thread All possible number combinations in perl by austinj

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