关于指针的一个小问题 - 编程论坛

#2

qq28901900442020-05-01 15:37

原来的数据不会被清0，你读到的是之前留下来的数据

[此贴子已经被作者于2020-5-1 17:15编辑过]

#3

forever742020-05-01 17:24

下课了老师还留下一黑板字儿呢。

#4

吕孟伟2020-05-02 09:22

回复 3楼 forever74

老哥总是这么形象呀！

#5

自由而无用2021-08-10 14:42

eg:
line 9 &p = 0x12ff9c; p = 0xcccccccc;
line 2 &q = 0x12ff94; q = &p = 0x12ff9c;
line 4 &i = 0x12ff90;
line 5 *q = p = &i = 0x12ff90;
line 11 *p = i = 5;
---------------------------------------------
# include <stdio.h>

void f(int **q)
{
    int i=5;

    *q=&i;
}

void rw_stack(void)
{
    int a[] = {10,11,12,13,14,18};
}

int main(void)
{
    int *p = (int *)&main;

    printf("*p=%x\n",*p);

    f(&p);

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

    rw_stack();

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

    return 0;
}