结构体数组和指针

结构体数组

struct Student {
  int id;
  int age;
  char * name;
};

int main() {
  struct Student arr[] = [{1,2,"大明"}];
  printf("%d",arr[0].age);
}

指针

struct Student {
  int id;
  int age;
  char * name;
};

int main() {
  struct Student arr = {1,2,"大明"};
  struct Student * p = &arr;
  printf("%d",(*p).age);
  //           ↓ 简化写法
  printf("%d",p->age);
}

传递结构体

struct Student {
  int id;
  int age;
  char * name;
};

void test(struct Student student) {
  student.id = 2;
}

void test2(struct Student * student) {
  student->id = 2;
}

int main() {
  struct Student arr = {1,2,"大明"};
  test(arr);
  //          ↓ 没有变化
  printf("%d",arr.id);
  // 如果需要修改那就需要使用指针
  test2(&arr);
  //          ↓ 有变化
  printf("%d",arr.id);
}