Not as fancy as some, but gives the output you specified. O might not be too bad as it's only a single pass through for the main number, and both operations can be done on the same pass. As always, YMMV.
#!/usr/bin/perl
use strict;
use warnings;
my @array=qw/a b c d/;
while ( @array > 1 ) {
my $first = shift(@array);
for my $next ( @array ) {
# take diff $first - $next;
# take product $first * $next;
print sprintf("%-8s%s\n","$first - $next","$first * $next");
}
}
exit;
__END__
a - b a * b
a - c a * c
a - d a * d
b - c b * c
b - d b * d
c - d c * d
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