如何使用指针

#include <stdio.h>



int main () {



   int  var = 20;   /* actual variable declaration */

   int  *ip;        /* pointer variable declaration */



   ip = &var;  /* store address of var in pointer variable*/



   printf("Address of var variable: %x\n", &var  );



   /* address stored in pointer variable */

   printf("Address stored in ip variable: %x\n", ip );



   /* access the value using the pointer */

   printf("Value of *ip variable: %d\n", *ip );



   return 0;

}