C program to interchange the contents of two variables without using any third variable

WRITE A PROGRAM TO INTERCHANGE THE CONTENTS OF THE TWO VARIABLES WITHOUT USING ANY THIRD VARIABLE


#include<stdio.h>
#include<conio.h>
void main()
{
  int a,b;
  printf("Enter two numbers a and b:");
  scanf("%d%d",&a,&b);
  a=a+b;
  b=a-b;
  a=a-b;
  printf("New values of a and b are %d, %d",a,b);
  getch();
}

Output:
  Enter two numbers a and b: 5
  6
  New values of a and b are 6,5