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.

Live Demo

#!/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

perl_operators.htm