These are also called relational operators. Assume variable $a holds 10 and variable $b holds 20 then, lets check the following numeric equality operators −
Sr.No. | Operator & Description |
---|---|
1 | == (equal to) Checks if the value of two operands are equal or not, if yes then condition becomes true. Example − ($a == $b) is not true. |
2 | != (not equal to) Checks if the value of two operands are equal or not, if values are not equal then condition becomes true. Example − ($a != $b) is true. |
3 | <=> Checks if the value of two operands are equal or not, and returns -1, 0, or 1 depending on whether the left argument is numerically less than, equal to, or greater than the right argument. Example − ($a <=> $b) returns -1. |
4 | > (greater than) Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. Example − ($a > $b) is not true. |
5 | < (less than) Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. Example − ($a < $b) is true. |
6 | >= (greater than or equal to) Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. Example − ($a >= $b) is not true. |
7 | <= (less than or equal to) Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. Example − ($a <= $b) is true. |
Try the following example to understand all the numeric equality operators available in Perl. Copy and paste the following Perl program in test.pl file and execute this program.
#!/usr/local/bin/perl $a = 21; $b = 10; print "Value of \$a = $a and value of \$b = $b\n"; if( $a == $b ) { print "$a == \$b is true\n"; } else { print "\$a == \$b is not true\n"; } if( $a != $b ) { print "\$a != \$b is true\n"; } else { print "\$a != \$b is not true\n"; } $c = $a <=> $b; print "\$a <=> \$b returns $c\n"; if( $a > $b ) { print "\$a > \$b is true\n"; } else { print "\$a > \$b is not true\n"; } if( $a >= $b ) { print "\$a >= \$b is true\n"; } else { print "\$a >= \$b is not true\n"; } if( $a < $b ) { print "\$a < \$b is true\n"; } else { print "\$a < \$b is not true\n"; } if( $a <= $b ) { print "\$a <= \$b is true\n"; } else { print "\$a <= \$b is not true\n"; }
When the above code is executed, it produces the following result −
Value of $a = 21 and value of $b = 10 $a == $b is not true $a != $b is true $a <=> $b returns 1 $a > $b is true $a >= $b is true $a < $b is not true $a <= $b is not true