C ++ simple implementation of address book management system

#include <iostream>
#include <stdlib.h>
#include <string>
using namespace std;
#define MAX 1000

//联系人结构体
struct Person {
    string M_name;      //姓名
    int M_sex;          //性别:1男 2女
    int M_age;          //年龄
    string M_phone;     //电话
    string M_address;       //地址
};

//通讯录结构体
struct Addressbooks {
    struct Person personArray[MAX]; //通讯录中保持的联系人数组
    int M_size;                     //通讯录中人员个数
};



//   展示菜单功能
void showMenu() {
     cout << "******************************" << endl;
     cout << "***** 1. 添 加 联 系 人 ******" << endl;
     cout << "***** 2. 显 示 联 系 人 ******" << endl;
     cout << "***** 3. 删 除 联 系 人 ******" << endl;
     cout << "***** 4. 查 找 联 系 人 ******" << endl;
     cout << "***** 5. 修 改 联 系 人 ******" << endl;
     cout << "***** 6. 清 空 联 系 人 ******" << endl;
     cout << "***** 0. 退 出 通 讯 录 ******" << endl;
     cout << "******************************" << endl;
}

//0. 退出通讯录
void exitMenu() {
    cout << "欢迎下次使用" << endl;
    system("pause");
    return;
}

//1. 添加联系人
void writePerson(Addressbooks *abs, int pos) {
    //姓名
    string name;
    cout << "请输入姓名：" << endl;
    cin >> name;
    abs->personArray[pos].M_name = name;

    cout << "请输入性别" << endl;
    cout << "1 -- 男" << endl;
    cout << "2 -- 女" << endl;
    //性别
    int sex = 0;
    while(true) {
        cin >> sex;
        if(sex == 1 || sex == 2) {
            abs->personArray[pos].M_sex = sex;
            break;
        }
        cout << "输入有误，请重新输入";
    }
    //年龄
    cout << "请输入年龄：" << endl;
    int age = 0;
    cin >> age;
    abs->personArray[pos].M_age = age;
    //联系电话
    cout << "请输入联系电话：" << endl;
    string phone = "";
    cin >> phone;
    abs->personArray[pos].M_phone = phone;
    //家庭住址
    cout << "请输入家庭地址: " << endl;
    string address = "";
    cin >> address;
    abs->personArray[pos].M_address = address;

    if(!name.empty() && sex && age && !phone.empty() && !address.empty()) {
        cout << "添加成功" << endl;
        system("pause");
        system("cls");
    }
}
void addPerson(Addressbooks *abs) {
    //判断电话本是否满了
    int pos = abs ->M_size;
    if(pos == MAX) {
        cout << "通讯录已满，无法添加" << endl;
        return;
    } else {
        cout << pos << endl;
        writePerson(abs, pos);
        abs->M_size++; //更新通讯录人数
        //cout << abs->M_size << endl;
    }
}

//2. 显示联系人
void printPerson(Addressbooks *abs, int pos) {
    cout << "姓名：" << abs->personArray[pos].M_name << "\t";
    cout << "性别: " << (abs->personArray[pos].M_sex == 1 ? "男" : "女") << "\t";
    cout << "年龄: " << abs->personArray[pos].M_age << "\t";
    cout << "电话：" << abs->personArray[pos].M_phone << "\t";
    cout << "住址：" << abs->personArray[pos].M_address << endl;
}

void showPerson(Addressbooks *abs) {
    if(abs->M_size == 0) {
        cout << " 当前记录为空" << endl;
    } else {
        for(int i = 0; i < abs->M_size; i++) {
            printPerson(abs, i);
        }
    }
    system("pause");
    system("cls");
}

//3. 删除联系人
int isExist(Addressbooks *abs, string name) {
    for(int i = 0; i < i; i++) {
        if(abs->personArray[i].M_name == name) {
            return i;
        }
    }
    return -1;
}

void deletePerson(Addressbooks *abs){
    cout << "请输入您要删除的联系人" << endl;
    string name;
    cin >> name;

    int ret = isExist(abs, name);
    if(ret != -1) {
        for(int i = ret; i <abs->M_size; i++) {
            abs->personArray[i] = abs->personArray[i + 1];
        }
        abs->M_size--;
        cout << "删除成功" << endl;
    } else {
        cout << "查无此人" << endl;
    }

    system("pause");
    system("cls");
}
//4. 查找联系人
void findPerson(Addressbooks *abs) {
    cout << "请输入您要查找的联系人" << endl;
    string name;
    cin >> name;

    int ret = isExist(abs, name);
    if(ret != -1) {
        printPerson(abs, ret);
    } else {
        cout << "查无此人" << endl;
    }
    system("pause");
    system("cls");
}

//5. 修改联系人
void modifyPerson(Addressbooks *abs) {
    cout << "请输入您要修改的联系人" << endl;
    string name;
    cin >> name;

    int ret = isExist(abs, name);
    if(ret != -1) {
        writePerson(abs, ret);
        cout << "修改成功" << endl;
    } else {
        cout << "查无此人" << endl;
    }
    system("pause");
    system("cls");
}

//6. 清空联系人
void cleanPerson(Addressbooks *abs) {
    abs->M_size = 0;
    cout << "通讯录已清空" << endl;
    system("pause");
    system("cls");
}

int main() {
    Addressbooks abs;   //创建通讯录
    abs.M_size = 0;     //初始化通讯录中人数
    int select = 0;     //选择的序号

    while(true) {
        showMenu();
        cin >> select;
        switch(select) {
            case 1: //添加联系人
                addPerson(&abs);
                break;
            case 2: //显示联系人
                showPerson(&abs);
                break;
            case 3: //删除联系人
                deletePerson(&abs);
                break;
            case 4: //查找联系人
                findPerson(&abs);
                break;
            case 5: //修改联系人
                modifyPerson(&abs);
                break;
            case 6: //清空联系人
                cleanPerson(&abs);
                break;
            case 0: //退出通讯录
                exitMenu();
                break;
            default:
                exitMenu();
                break;
            }
        }

    system("pause");
    
    return 0;
}