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Perl Numeric Equality Operators Example
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. |
Example
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