C语言写一个通讯录数据库的具体代码

以下是一个简单的C语言通讯录数据库的代码示例：

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

#define MAX_NAME_LEN 50
#define MAX_PHONE_LEN 20
#define MAX_EMAIL_LEN 50
#define MAX_CONTACTS 100

struct Contact {
char name[MAX_NAME_LEN];
char phone[MAX_PHONE_LEN];
char email[MAX_EMAIL_LEN];
};

struct Contact contacts[MAX_CONTACTS];
int num_contacts = 0;

void add_contact() {
if (num_contacts >= MAX_CONTACTS) {
printf("通讯录已满，无法添加新联系人。\n");
return;
}

struct Contact new_contact;

printf("请输入联系人姓名：");
scanf("%s", new_contact.name);

printf("请输入联系人电话号码：");
scanf("%s", new_contact.phone);

printf("请输入联系人电子邮件地址：");
scanf("%s", new_contact.email);

contacts[num_contacts] = new_contact;
num_contacts++;

printf("联系人已添加到通讯录。\n");
}

void list_contacts() {
printf("通讯录中的联系人：\n");

for (int i = 0; i < num_contacts; i++) {
printf("%s\t%s\t%s\n", contacts[i].name, contacts[i].phone, contacts[i].email);
}
}

int main() {
int choice;

while (1) {
printf("请选择操作：\n");
printf("1. 添加联系人\n");
printf("2. 列出所有联系人\n");
printf("3. 退出\n");

scanf("%d", &choice);

switch (choice) {
case 1:
add_contact();
break;
case 2:
list_contacts();
break;
case 3:
printf("谢谢使用！\n");
exit(0);
default:
printf("无效的选择，请重新输入。\n");
}
}

return 0;
}