C Program to Swap the Contents of two Numbers using Bitwise XOR Operation

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This is a C Program to swap the contents of two numbers using bitwise xor operation.

Problem Description

This C Program swaps the contents of two numbers using bitwise XOR operation.

Problem Solution

Take input from the user and swaps the contents of two numbers using bitwise XOR operation.

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Program/Source Code

Here is source code of the C program to swap the contents of two numbers using bitwise XOR operation. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

/*
 * C program to swap the contents of two numbers using bitwise XOR
 * operation. Don't use either the temporary variable or arithmetic
 * operators
 */
#include <stdio.h>
 
void main()
{
    long i, k;
 
    printf("Enter two integers \n");
    scanf("%ld %ld", &i, &k);
    printf("\n Before swapping i= %ld and k = %ld", i, k);
    i = i ^ k;
    k = i ^ k;
    i = i ^ k;
    printf("\n After swapping i= %ld and k = %ld", i, k);
}
Program Explanation

In this C program, we are reading two integers using ‘i’ and ’k’ integer variables respectively. To swap the integer values without using a temporary variable or arithmetic operators. The bitwise XOR operator is used to copy the bit if it is set in one operand but not both. Print the swapped values of numbers.

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Runtime Test Cases
 
$ cc pgm48.c
$ a.out
Enter two integers
45
89
 
Before swapping i= 45 and k = 89
After swapping i= 89 and k = 45

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Here’s the list of Best Reference Books in C Programming, Data-Structures and Algorithms

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If you wish to look at other example programs on Simple C Programs, go to Simple C Programs. If you wish to look at programming examples on all topics, go to C Programming Examples.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn