Q. Interchange two variable without using third variable ?

 THE OUTPUT WOULD BE

#include<stdio.h>
#include<conio.h>
  void main( )
  {    clrscr( );
        int a,b;
        printf("Enter a :");
        scanf("%d",&a);
        printf("Enter b :");
        scanf("%d",&b);
        a=a+b;
        b=a-b;
        a=a-b;
        printf("Interchange value of a=%d",a);
        printf(" Interchange value of b=%d",b);
        getch( );
  }