指標 <題目1：指標基本語法>

#include <stdio.h>

int main()

{

int a = 10, b = 20;



int *p ;

p =
&a
; // let p point to a

printf("%d\n", *p); // 10



*
p = 30;

printf("%d\n", a); // 30



int *q = &b ;

// define q and initialize q by b's address

printf("%d\n", *q); // 20



q =
p;

printf("%d %d\n", b, *q); // 20 30

q = &b;



*q =
*p;

printf("%d %d\n", a, b); // 30 30



return 0;

}