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How to swap two numbers without using temporary variable in C Language?

Introduction: In this article i will explain How to swap/interchange the values of two numbers using C language with an example program.

Description: Swapping the value of two numbers in C Language is off course a very easy task. But how many of us actually know that there are multiple ways to swap the value of two variables in C language. There are a number of ways to swap the value of two numbers in C Language.  In this article I am going to use Addition (+) and Subtraction (-) arithmetic operators to help in swapping. In previous articles How to swap two numbers in C Language ? I explained how to swap two numbers using temporary variable and in another article Another way to swap two numbers without using temporary variable in C Language? i explained one more way to swap two numbers in C Language .

Implementation: let's create a program to swap the value of two numbers.


#include<stdio.h>
#include<conio.h>
void main()
{
 int a,b;
  clrscr();
 printf("Enter the value of a= ");
 scanf("%d",&a);
 printf("\nEnter the value of b= ");
 scanf("%d",&b);

 printf("\nValue of a before swapping= %d",a);
 printf("\nValue of b before swapping= %d",b);
 a=a+b;
 b=a-b;
 a=a-b;
 printf("\nValue of a after swapping= %d",a);
 printf("\nValue of b after swapping= %d",b);
 getch();
 }

Run the program using Ctrl+F9

Output:
Enter the value of a=10
Enter the value of b=20

Value of a before swapping=10
Value of b before swapping=20
Value of a after swapping=20
Value of b after swapping=10

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