Program to swap the numbers by Call By Referance in C

#include
#include
main()
 {
  clrscr();
  int a=10,b=20;
  void swapr(int*,int*);
  clrscr();
 printf("\nEnter The Vale Of A & B:=");
  scanf("%d%d",&a,&b); 
  printf("\n\t A=%d",a);
  printf("\n\t B=%d",b);
  swapr(a,b);
  printf("\n\n\tAfter Sweping The Value");
  printf("\n\n\t A=%d",a);
  printf("\n\t B=%d",b);
  getch();
 }
void swapr(int,int)
int *x,*y;
  {
   int *z=0;
   *z=*x;
   *x=*y;
   *y=*z;
  }