xref: /openbsd/gnu/usr.bin/perl/t/op/lop.t (revision 7b36286a) 
1#!./perl
2
3#
4# test the logical operators '&&', '||', '!', 'and', 'or', 'not'
5#
6
7BEGIN {
8    chdir 't' if -d 't';
9    @INC = '../lib';
10}
11
12print "1..7\n";
13
14my $test = 0;
15for my $i (undef, 0 .. 2, "", "0 but true") {
16    my $true = 1;
17    my $false = 0;
18    for my $j (undef, 0 .. 2, "", "0 but true") {
19	$true &&= !(
20	    ((!$i || !$j) != !($i && $j))
21	    or (!($i || $j) != (!$i && !$j))
22	    or (!!($i || $j) != !(!$i && !$j))
23	    or (!(!$i || !$j) != !!($i && $j))
24	);
25	$false ||= (
26	    ((!$i || !$j) == !!($i && $j))
27	    and (!!($i || $j) == (!$i && !$j))
28	    and ((!$i || $j) == ($i && !$j))
29	    and (($i || !$j) != (!$i && $j))
30	);
31    }
32    if (not $true) {
33	print "not ";
34    } elsif ($false) {
35	print "not ";
36    }
37    print "ok ", ++$test, "\n";
38}
39
40# $test == 6
41my $i = 0;
42(($i ||= 1) &&= 3) += 4;
43print "not " unless $i == 7;
44print "ok ", ++$test, "\n";
45