Swap 2 variable content without Temporary variable

Why would you ever EVER want to use this technique? There’s no fathomable reason that you’d ever not want to use a temporary variable.

The method mentioned wont work because it doesn’t take into account overflow errors. Suppose for example if we had to swap two signed numbers 1 and 32767 on a system where int is 16 bits long. On such a system, the maximum value an int can store (INT_MAX) would typically be 32767.So when the first step var1+var2 is executed the result would be 32768, which would be larger than the maximum value that can be stored in an int variable. Consequently this value cant be stored in var1 and hence an overflow occurs. What happens after this is undefined. No matter what happens under the hood, the result is bound to be undefined and hence this method fails whenever an overflow occurs.

Swapping of Two String without using Temporary Variables and Avoiding The Creation of More Than 2 Values and Without using Array or Even explode/implode or using marker(separator) USING PHP:

<?php

$string1 = “Hello”;
$string2 = “Jun”;

$string1 = $string2 . $string1;
$string2 = substr( $string1 , strlen( $string2 ) , strlen($string1) );
$string1 = substr( $string1 ,0, strlen( $string1 ) - strlen($string2) );

echo “$string1″;
echo “$string2″;

?>

Another one is using exclusive-or:

1: x = x ^ y;
2: y = y ^ x;
3: x = x ^ y;

Let’s see: suppose x is 1001 and y is 1100:
1: x is 0101 and y is 1100
2: x is 0101 and y is 1001
3: x is 1100 and y is 1001

hi uma ……….
hats off to ur logic the ritesh provided method will not work for overflow and hence can be implemented in a range only