PHP | gmp_neg() Function

The gmp_neg() function is an in-built function in PHP which returns the negative of a GMP number (GNU Multiple Precision). Syntax :

gmp_neg( $num )

Parameters : The function accepts only one mandatory parameter $num which can be either a GMP number resource in PHP 5.5 or a GMP object in PHP version 5.6 and later, or numeric strings can be passed to the function provided that it is possible to convert those strings to numbers. Return Values : This function returns a GMP number (in PHP 5.5 and earlier) or a GMP object (in PHP 5.6 and later) which is negative of the value of $num. Examples :

 Input : $num = 255 Output : -255 Input : $num = 128 Output : -128 

Below programs will illustrate the gmp_neg() function : Program 1: php

<?php //PHP program to illustrate //gmp_neg() function $num = gmp_init("255"); $num1 = gmp_neg($num); echo gmp_strval($num1); ?> 

Output:

-255

Program 2: php

<?php //PHP program to illustrate //gmp_neg() function $num = gmp_init("314567128"); $num1 = gmp_neg($num); echo gmp_strval($num1); ?> 

Output:

-314567128

Reference : http://php.net/manual/en/function.gmp-neg.php