Exchange values using call by reference

Program:

#include<stdio.h>
void exch(int *a,int *b)
{
  int temp;
  temp=*a;
  *a=*b;
  *b=temp;
  printf("Inside Function::\n");
  printf("a=%d b=%d\n",*a,*b);
}
int main()
{
int x,y;
printf("Enter value of x and y: \n");
scanf("%d%d",&x,&y);
exch(&x,&y);
    printf("From main Function::\n");
    printf("x=%d y=%d\n",x,y);
    return 0;
}

Output: