C program to swap two numbers without using a temporary variable

In this article we will learn to implement a C program to swap two numbers without using a temporary variable. A C program is provided below which reads two numbers and interchanges them with using a temporary variable.

Program is as follows:

//C program to swap two numbers without using a temporary variable
#include<stdio.h>
#include<conio.h>
void main()
{
	int num1, num2;
	printf("Enter first number: ");
	scanf("%d",&num1);
	printf("Enter second number: ");
	scanf("%d",&num2);
	printf("\nBefore swap num1 and num2 are %d and %d",num1,num2);
	num1=num1+num2;
	num2=num1-num2;
	num1=num1-num2;
	printf("\nAfter swap num1 and num2 are %d and %d",num1,num2);
	getch();
}

Input and output for the above program is as follows:

Enter first number: 5
Enter second number: 4

Before swap num1 and num2 are 5 and 4
After swap num1 and num2 are 4 and 5

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.