#include <stdio.h>

void swap(int *x, int *y);

int main () {

   int a = 100;
   int b = 200;

   printf("Before swap, value of a : %d\n", a );
   printf("Before swap, value of b : %d\n", b );


   swap(&a, &b);

   printf("After swap, value of a : %d\n", a );
   printf("After swap, value of b : %d\n", b );

   return 0;

}

void swap(int *x, int *y) {

    *x = 2000;
    *y = 2000;

   return;
}