练习31 使用指针进行简单操作

//使用指针来进行简单操作

#include"stdio.h"

void f_p(int *p1, int *p2){    *p1 = 20;    *p2 = 21;}

int main(){    int a, b;    int *pointer_1, *pointer_2;    a = 100; b = 10;    pointer_1 = &a;    pointer_2 = &b;    printf("%d,%d\n", a, b);    printf("%d,%d\n", *pointer_1, *pointer_2);    //输出指针地址    printf("%d,%d\n", pointer_1, pointer_2);

    a = 1;    //若改变a的值,则指向a的指针同步改变    printf("\n改变a的值 a = 1\n");    printf("%d,%d\n", a, b);    printf("%d,%d\n", *pointer_1, *pointer_2);    printf("%d,%d\n", pointer_1, pointer_2);

    f_p(pointer_1, pointer_2);    //若通过函数改变指针的值，则同步改变a、b的值    printf("\n指针变量作为函数参数\n");    printf("%d,%d\n", a, b);    printf("%d,%d\n", *pointer_1, *pointer_2);    printf("%d,%d\n", pointer_1, pointer_2);

    return 0;}