面试题：C语言结构体成员访问与操作（高级难度）

Question

给定以下结构体层次定义： ```c struct address { char city[20]; char street[30]; int zip; }; struct employee { char name[20]; int id; struct address emp_address; }; ``` 编写一个函数，该函数接收一个`struct employee`类型的数组指针和数组长度作为参数，查找出所有居住在特定城市（函数参数传入城市名）的员工信息并输出。要求使用指针操作来访问结构体成员。

Answer 1

#include <stdio.h>
#include <string.h>

void findEmployeesByCity(struct employee *employees, int length, const char *city) {
    for (int i = 0; i < length; i++) {
        if (strcmp((employees + i)->emp_address.city, city) == 0) {
            printf("Name: %s, ID: %d, City: %s, Street: %s, Zip: %d\n", 
                   (employees + i)->name, (employees + i)->id, 
                   (employees + i)->emp_address.city, (employees + i)->emp_address.street, 
                   (employees + i)->emp_address.zip);
        }
    }
}