Program to swap two numbers without using third variable

Swapping means interchanging values of a and b, i.e, value of a in b and b in a.

#include<stdio.h>

void main()

{

int a, b;

printf("Enter value in a and b:");

scanf("%d %d", &a, &b);

a= a+b;

b= a-b;

a= a-b;

printf("\na= %d, b= %d", a,b);

printf("\n Value Swapped");

EXPLANATION:-

a=10 , b=20;

a= a+b=30;

b= a-b= 30-20=10;

a= a-b= 30-10=20;

So, a=20 and b=10 (value swapped)