Program to swap to numbers without using third variable in c language

program:-

#include<stdio.h>

#include<conio.h>

void main()

{

int a,b;

printf("Enter two numbers");

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

a=a+b;

b=a-b;

a=a-b;

printf("first number=%d and second number=%d",a,b);

getch();

}