Write a C program to input any two numbers from user and swap values of both numbers using bitwise operator. How to swap two number using bitwise operator in C programming.

Input first number: 22

Input second number: 65

Output first number after swapping: 65

Output second number after swapping: 22

Let's suppose two integer values a and b

And let's suppose x = a ^ b

Then again x ^ b will evaluate to a and x ^ a will evaluate to b.

We are going to use this property of bitwise XOR operator to swap two numbers without using third variable.

Happy coding ;)

**Example:**Input first number: 22

Input second number: 65

Output first number after swapping: 65

Output second number after swapping: 22

### Required knowledge:

Basic C programming, Bitwise operator### Logic:

There are tons of discussions going around the internet about swapping two numbers without using a temporary variable (third variable). Swapping two numbers through bitwise XOR ^ operator is a solution to the problem mentioned above. We know that bitwise XOR operator evaluates each bit of the result to 1 if each corresponding bits of the two operands differ else evaluates to 0. Apart from this property bitwise operator also has an special property which can be explained through an example:Let's suppose two integer values a and b

And let's suppose x = a ^ b

Then again x ^ b will evaluate to a and x ^ a will evaluate to b.

We are going to use this property of bitwise XOR operator to swap two numbers without using third variable.

### Program:

/** * C program to swap two numbers using bitwise operator */ #include <stdio.h> int main() { int num1, num2; //Reads two numbers from user printf("Enter any two numbers: "); scanf("%d%d", &num1, &num2); printf("Original value of num1 = %d\n", num1); printf("Original value of num2 = %d\n", num2); num1 ^= num2; num2 ^= num1; num1 ^= num2; printf("Num1 after swapping = %d\n", num1); printf("Num2 after swapping = %d\n", num2); return 0; }

Output

Enter any two numbers: 22

65

Original value of num1 = 22

Original value of num2 = 65

Num1 after swapping = 65

Num2 after swapping = 22

65

Original value of num1 = 22

Original value of num2 = 65

Num1 after swapping = 65

Num2 after swapping = 22

Happy coding ;)

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