Swap two numbers using Pointers in C programming

#include<stdio.h>
#include<conio.h>

void swap(int*,int*);

void main()
{
  int a,b;
  clrscr();
  printf("enter first number  :");
  scanf("%d",&a);
  printf("enter second number :");
  scanf("%d",&b);
  clrscr();
  printf("Before swapping\n\t\ta=%d\n\n\t\tb=%d",a,b);
  swap(&a,&b);
  printf("\n\nAfter swapping\n\t\ta=%d\n\n\t\tb=%d",a,b);
  getch();
}
 
  void swap(int *x,int *y)
  {
    int z;
    z=*y;
    *y=*x;
    *x=z;
   }