A Collection of Code Snippets in as Many Programming Languages as Possible
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Welcome to the Factorial in Perl page! Here, you’ll find the source code for this program as well as a description of how the program works.
#!/usr/bin/env perl
use strict;
use warnings;
# no input
usage() unless @ARGV == 1;
# accept input as argument
my ($number) = @ARGV;
# if not provided, read from standard input
if (!defined $number) {
$number = <STDIN>;
chomp $number;
}
if (!defined $number || $number !~ /^\d+$/ || $number < 0) {
usage();
}
my $factorial = 1;
for (my $i = 1; $i <= $number; $i++) {
$factorial = $factorial * $i;
}
print "$factorial\n";
sub usage {
print "Usage: please input a non-negative integer\n";
exit;
}
Factorial in Perl was written by:
If you see anything you’d like to change or update, please consider contributing.
Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 16 2019 15:02:04. The solution was first committed on Oct 14 2019 22:44:32. As a result, documentation below may be outdated.
No ‘How to Implement the Solution’ section available. Please consider contributing.
No ‘How to Run the Solution’ section available. Please consider contributing.