我在gcc(x64)上编译了下面的代码。
为什么我可以通过点号(people[0].name)访问结构体元素,而不是'->'?
people[0]不是指向结构体的地址吗?我应该使用people[0]->name或(*people[0]).name来访问name吗?
代码:
#include <stdio.h>
#define TOTAL 4
int main(void) {
typedef struct tagPerson {
char name[12];
int ID;
} Person;
#define LPPERSON Person*
Person * people = calloc(sizeof(Person), TOTAL);
strncpy(people[0].name, "Henry", 12);
strncpy(people[1].name, "Jacob", 12);
printf("sizeof(people)=%d\n", sizeof(people));
printf("people[0].name=%s\n", people[0].name);
printf("sizeof(people[0])=%d\n", sizeof(people[0]));
printf("people[1].name=%s\n", people[1].name);
printf("sizeof(people[1])=%d\n", sizeof(people[1]));
free(people);
return 0;
}
输出:
sizeof(people)=8
people[0].name=Henry
sizeof(people[0])=16
people[1].name=Jacob
sizeof(people[1])=16
calloc
时交换了参数。 - Some programmer dudestrncpy()
是危险的。(嗯,每一个 使用 strncpy() 都是危险的...) - wildplasser