| 1 | #!./perl |
| 2 | |
| 3 | # |
| 4 | # test the logical operators '&&', '||', '!', 'and', 'or', 'not' |
| 5 | # |
| 6 | |
| 7 | BEGIN { |
| 8 | chdir 't' if -d 't'; |
| 9 | @INC = '../lib'; |
| 10 | require './test.pl'; |
| 11 | } |
| 12 | |
| 13 | plan tests => 17; |
| 14 | |
| 15 | for 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 | my $m = ! defined $i ? 'undef' |
| 33 | : $i eq '' ? 'empty string' |
| 34 | : $i; |
| 35 | ok( $true, "true: $m"); |
| 36 | ok( ! $false, "false: $m"); |
| 37 | } |
| 38 | |
| 39 | my $i = 0; |
| 40 | (($i ||= 1) &&= 3) += 4; |
| 41 | is( $i, 7, '||=, &&='); |
| 42 | |
| 43 | my ($x, $y) = (1, 8); |
| 44 | $i = !$x || $y; |
| 45 | is( $i, 8, 'negation precedence with ||' ); |
| 46 | |
| 47 | ++$y; |
| 48 | $i = !$x || !$x || !$x || $y; |
| 49 | is( $i, 9, 'negation precedence with ||, multiple operands' ); |
| 50 | |
| 51 | $x = 0; |
| 52 | ++$y; |
| 53 | $i = !$x && $y; |
| 54 | is( $i, 10, 'negation precedence with &&' ); |
| 55 | |
| 56 | ++$y; |
| 57 | $i = !$x && !$x && !$x && $y; |
| 58 | is( $i, 11, 'negation precedence with &&, multiple operands' ); |