Perl Logical Operators Example


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There are following logical operators supported by Perl language. Assume variable $a holds true and variable $b holds false then −

S.No. Operator & Description
1. and

Called Logical AND operator. If both the operands are true then then condition becomes true.

Example − ($a and $b) is false.

2. &&

C-style Logical AND operator copies a bit to the result if it exists in both operands.

Example − ($a && $b) is false.

3. or

Called Logical OR Operator. If any of the two operands are non zero then then condition becomes true.

Example − ($a or $b) is true.

4. ||

C-style Logical OR operator copies a bit if it exists in eather operand.

Example − ($a || $b) is true.

5. not

Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.

Example − not($a and $b) is true.

Example

Try the following example to understand all the logical operators available in Perl. Copy and paste the following Perl program in test.pl file and execute this program.

#!/usr/local/bin/perl
 
$a = true;
$b = false;

print "Value of \$a = $a and value of \$b = $b\n";

$c = ($a and $b);
print "Value of \$a and \$b = $c\n";

$c = ($a  && $b);
print "Value of \$a && \$b = $c\n";

$c = ($a or $b);
print "Value of \$a or \$b = $c\n";

$c = ($a || $b);
print "Value of \$a || \$b = $c\n";

$a = 0;
$c = not($a);
print "Value of not(\$a)= $c\n";

When the above code is executed, it produces the following result −

Value of $a = true and value of $b = false
Value of $a and $b = false
Value of $a && $b = false
Value of $a or $b = true
Value of $a || $b = true
Value of not($a)= 1

perl_operators.htm

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