结构指针返回结构成员的起始字节 [英] Structure pointer returning the start byte of member of structure

问题描述

返回结构成员起始字节的结构指针 我不知道它是如何工作的.请请一些人帮助我了解这一点.

Structure pointer returning the start byte of member of structure .I wondered how it works. PLease some one help me to get know about this.

 #include <stdio.h>

 typedef struct node {
  char mem;
  double mem2;
  char mem3;
  int mem4;
  char mem5;
  char mem6;
 }NODE;
 int main()
 {
     NODE * m;
     printf("%u",&m->mem3);
     return 0;
 }

输出为16

推荐答案

该程序实际上应该崩溃，因为指针m没有指向有效的内存位置.下面的代码可以给出结果.

The program actually should crash because pointer m is not pointing valid memory location. Below code can give the result.

NODE M;
NODE *ptr = &m;
Printf("%x", &ptr->mem3);

％x将给出十六进制地址值.

%x will give hexadecimal address value.

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