Program to show working of pointers.

main()
{
 int x, *p, y;
 clrscr();
 x=10;
 p=&x;
 y=*p;
 printf("Value of X: %d\nValue of P: %u\nValue of Y: %d",x,p,y);
 printf("\nAddress of X: %u\nAddress of P: %u\nAddress of Y: %u",&x,&p,&y);
 *p=20;
 printf("\nNow Value of X: %d and Y: %d",x,y);
 getch();
}