How to specify multiple boolean comparisons in Perl?

Question

Is it while ($x > 3 || $y < 2) like in other programming languages? I literally can't find anywhere online that tells me how to do this in Perl.

https://users.cs.cf.ac.uk/Dave.Marshall/PERL/node35.html http://www.perlmonks.org/?node_id=990 — AbhiNickz, Nov 09 '16 at 11:32
@AbhiNickz that tutorial is incredibly out of date. While the general information is correct, it contains a lot of information that rings my alarm bells. It declares variables without `my`, it tells you it's ok to use strings with the number comparison operators and it uses _PERL_ as the name of the language, which is outright wrong. Please don't use this resource. It's overstayed its usefulness. Thank you. — simbabque, Nov 09 '16 at 11:40
Yeah, I checked again, I just wanted to show OP that there are lots of online resource that I found in just one google search. — AbhiNickz, Nov 09 '16 at 12:34

score 3 · Answer 1 · answered Nov 09 '16 at 11:30

3

Try perldoc perlop. There’s both C-style || + && available and or + and with different operator priority.

answered Nov 09 '16 at 11:30

zoul

score 3 · Answer 2 · answered Nov 09 '16 at 11:48

Is it while ($x > 3 || $y < 2) like in other programming languages?

Yes it's the same.

Let's put it into an example.

#!/usr/bin/perl
use strict;
use warnings;
my $x = 10;
my $y = 0;
while ($x > 3 || $y < 2){
    print "X is $x, Y is $y\n";
    $x--;
    $y++;
}

Output:

X is 10, Y is 0
X is 9, Y is 1
X is 8, Y is 2
X is 7, Y is 3
X is 6, Y is 4
X is 5, Y is 5
X is 4, Y is 6

Pretty easy, right?

2 Answers2