Program to swap two values without using third variable in C.

Code Box
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/*program to swap two values without using third variable */

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();

printf("\nEnter two numbers :");
printf("\nEnter first number a= ");
scanf("%d",&a);

printf("\nEnter second number b= ");
scanf("%d",&b);

printf("\nValues before swapping a= %d & b= %d ",a,b);

a=a+b;   //swapping
b=a-b;
a=a-b;

printf("\nValues after swapping a= %d & b= %d ",a,b);

getch();
}