Add Two Numbers Without using Arithmetic Operators in PHP
This article will show you how to add two numbers without using Arithmetic operators in PHP. There are two methods to add two numbers, these are:
Table of Content
- Using Bitwise Operators
- Using Recursion
Using Bitwise Operators
We will use Bitwise Operator to add two numbers. First, we check num2 is not equal to zero, then Calculate the carry using & operator, and then use XOR operator to get sum of numbers, At last, shift the carry to 1 left.
PHP
<?php function addNum( $num1 , $num2 ) { while ( $num2 != 0) { // Calculate the carry $carry = $num1 & $num2 ; // XOR to get the sum $num1 = $num1 ^ $num2 ; // Shift the carry to the left $num2 = $carry << 1; } return $num1 ; } // Driver Code $num1 = 5; $num2 = 7; echo "Sum : " . addNum( $num1 , $num2 ); ?> |
Output
Sum : 12
Using Recursion
In this section, we will use the above approach with Recursion to calculate the sum of two numbers.
Example:
PHP
<?php function addNum( $num1 , $num2 ) { if ( $num2 == 0) { return $num1 ; } else { return addNum( $num1 ^ $num2 , ( $num1 & $num2 ) << 1); } } // Driver Code $num1 = 5; $num2 = 7; echo "Sum : " . addNum( $num1 , $num2 ); ?> |
Output
Sum : 12
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