c语言结构体指针相等,C语言 结构体指针与自增运算符

http://blog.youkuaiyun.com/edwzhang/article/details/7227794

2012

测试代码：

#include

#include

int main() {

struct student {

char *name;

int score;

};

struct student st = {"Brian", 97};

struct student *ptr = &st;

printf("ptr->name = %s\n", ptr->name);

printf("*ptr->name = %c\n", *ptr->name);

printf("*ptr->name++ = %c\n", *ptr->name++);

printf("*ptr->name = %c\n", *ptr->name);

printf("ptr->score = %d\n", ptr->score);

printf("ptr->score++ = %d\n", ptr->score++);

printf("ptr->score = %d\n", ptr->score);

return 0;

}

=== 运行结果：

ptr->name = Brian

*ptr->name = B

*ptr->name++ = B

*ptr->name = r

ptr->score = 97

ptr->score++ = 97

ptr->score = 98

=== 分析：

1. ptr->name，这个不说了。

2. *ptr->name，因为->的优先级高于*，所以相当于： *(ptr->name)。即指针首地址的那个字符。

3. *ptr->name++，由于*和++的优先级相同，而且结合性是由右至左，所以相当于： *((ptr->name)++)，即获取首地址字符后，将name指针右移一位。(当前打印还是首地址的值)

4. *ptr->name，此处为验证上一步的指针位置。