Boolean values: Difference between revisions
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=={{header|Perl}}== |
=={{header|Perl}}== |
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<lang perl>my $x = 0.0; |
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my $true_or_false = $x ? 'true' : 'false'; # false |
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</lang> |
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or |
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<lang perl>my $x = 1; # true |
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my $true_or_false; |
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if($x){ |
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$true_or_false = 'true'; |
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}else{ |
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$true_or_false = 'false'; |
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} |
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</lang> |
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The values in Perl that are false are: <tt>0</tt> (as a number (including <tt>0.0</tt>), or as the string <tt>'0'</tt>, but '''not''' the string <tt>'0.0'</tt>), the empty string <tt><nowiki>''</nowiki></tt>, the empty list <tt>()</tt>, and <tt>undef</tt>. Everything else is true. See [http://perldoc.perl.org/perlsyn.html#Truth-and-Falsehood perlsyn]. |
The values in Perl that are false are: <tt>0</tt> (as a number (including <tt>0.0</tt>), or as the string <tt>'0'</tt>, but '''not''' the string <tt>'0.0'</tt>), the empty string <tt><nowiki>''</nowiki></tt>, the empty list <tt>()</tt>, and <tt>undef</tt>. Everything else is true. See [http://perldoc.perl.org/perlsyn.html#Truth-and-Falsehood perlsyn]. |
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