一直在报错，而且这个自定义函数不知道错在哪里

写了一个通讯录管理系统，有个错误一直无法改正

#include
#include//添加字符串的头文件 
#include//添加C语言的头文件 
#include //解决system()不明确问题
#define MAX 1000
using namespace std;
struct person//个人结构体 
{
    string person_name;//姓名 
    int person_age;//年龄 
    int person_sex;//性别 
    string person_phone;//电话 
    string person_address;//地址 
};
struct personbooks//通讯录结构体 
{
    struct person personarray[MAX]; //建立通讯录数组 
    int personnumber_size;//更新记录联系人的信息 
};
void show_linkman_menu()//显示需要输入的菜单提醒 
{
    cout << "*******************" << endl;
    cout << "***1、添加联系人***" << endl;
    cout << "***2、显示联系人***" << endl;
    cout << "***3、查找联系人***" << endl;
    cout << "***4、删除联系人***" << 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;
};
void add_linkman(personbooks* abs)
{
    cout << "请输入联系人的名字：" << endl;
    string name;
    cin >> name;
    abs->personarray[abs->personnumber_size].person_name = name;
    cout << "请输入该联系人的年龄在0-120以内：" << endl;
    int age;
    cin >> age;
    while (true)
    {
        if (age > 0 && age <= 120)
        {
            abs->personarray[abs->personnumber_size].person_age = age;
        }
        else
        {
            cout << "输入有误，请重新输入" << endl;
        }
    }
    cout << "请输入性别：1--男或2--女" << endl;
    int sex;
    cin >> sex;
    if (sex != 1 || sex != 2)
    {
        cout << "输入错误，请重新输入" << endl;
    }
    else
    {
        abs->personarray[abs->personnumber_size].person_sex = sex;
    }
    cout << "请输入该联系人的电话号码：" << endl;
    string phone;
    cin >> phone;
    int len = phone.size();
    if (len != 11)//检查电话号码的个数是否符合要求 
    {
        cout << "请重新输入电话号码，输入有误！" << endl;
    }
    else
    {
        abs->personarray[abs->personnumber_size].person_phone = phone;
    }
    cout << "请输入该联系人的地址：" << endl;
    string address;
    cin >> address;
    abs->personarray[abs->personnumber_size].person_address = address;
    cout << "该联系人添加成功！" << endl;
    abs->personnumber_size++;//更新联系人的数量; 
}
void show_linkman(personbooks* abs)//显示已添加的所有联系人 
{
    if (abs->personnumber_size == 0)
    {
        cout << "尚未添加任何联系人！" << endl;
    }
    else
    {
        for (int i = 0; i < abs->personnumber_size; i++)
        {
            cout << "姓名：" << abs->personarray[i].person_name << "\t"
                << "年龄：" << abs->personarray[i].person_age << "\t"
                << "性别：" << (abs->personarray[i].person_sex == 1 ? "男":"女") << "\t"
                << "电话：" << abs->personarray[i].person_phone << "\t"
                << "地址：" << abs->personarray[i].person_address << endl;
        }
    }
    system("pause");
    system("cls");
}
int whether_exist_linkman1(personbooks* abs, string name)//查找联系人姓名是否存在 
{
    for (int i = 0; i < abs->personnumber_size; i++)
    {
        if (abs->personarray[i].person_name == name)
        {
            return i;
        }
    }
    return -1;
}
int whether_exist_linkman2(personbooks* abs, string phone)//查找联系人电话是否存在 
{
    for (int i = 0; i < abs->personnumber_size; i++)
    {
        if (abs->personarray[i].person_phone == phone)
        {
            return i;
        }
    }
    return -1;
}
int whether_exist_linkman3(personbooks* abs, string address)//查找联系人是否存在 
{
    for (int i = 0; i < abs->personnumber_size; i++)
    {
        if (abs->personarray[i].person_address == address)
        {
            return i;
        }
    }
    return -1;
}

void find_linkman(personbooks* abs)//查着联系人 
{
    int ret;
    if (abs->personnumber_size == 0)
    {
        cout << "联系人为空，无法查找！" << endl;
        system("pause");
        system("cls");
        return;
    }
    else
    {
        cout << "请输入你要查找联系人的姓名或者电话号码或者地址：" << endl;
        string name, phone, address;
        if (cin >> name)
        {
            ret = whether_exist_linkman1(abs, name);
        }
        else if (cin >> phone)
        {
            ret = whether_exist_linkman2(abs, phone);
        }
        else if (cin >> address)
        {
            ret = whether_exist_linkman3(abs, address);
        }
    }
    if (ret == -1)
    {
        cout << "查无此人！" << endl;
    }
    else
    {
        cout << "姓名：" << abs->personarray[ret].person_name << " || " <<
            "年龄：" << abs ->personarray[ret].person_age << " || " <<
            "性别：" << (abs->personarray[ret].person_sex == 1 ? "男":"女") << " || " <<
            "电话：" << abs->personarray[ret].person_phone << " || " <<
            "地址：" << abs->personarray[ret].person_address << endl;
    }
    system("pause");
    system("cls");
}
void delete_linkman(personbooks* abs)//删除通讯录里的联系人 
{
    int ret;
    if (abs->personnumber_size == 0)
    {
        cout << "该通讯录为空！" << endl;
        system("pause");
        system("cls");
        return;
    }
    else
    {
        cout << "请输入联系人的姓名或者电话或者地址：" << endl;
        string name, phone, address;
        if (cin >> name)
        {
            int ret = whether_exist_linkman1(abs, name);
        }
        else if (cin >> phone)
        {
            int ret = whether_exist_linkman2(abs,phone);
        }
        else if (cin >> address)
        {
            int ret = whether_exist_linkman3(abs, address);
        }
    }
    if (ret == -1)
    {
        cout << "查无此人！" << endl;
    }
    else
    {
        for (int i = ret; i < abs->personnumber_size; i++)
        {
            abs->personarray[i] = abs->personarray[i + 1];
        }
        cout << "删除成功！" << endl;
        abs->personnumber_size--;//更新数组大小 
    }
    system("pause");
    system("cls");
}
void modify_linkman(personbooks* abs)//修改联系人 
{
    if (abs->personnumber_size == 0)
    {
        cout << "该通讯录为空！" << endl;
        system("pause");
        system("cls");
        return;
    }
    else
    {
        cout << "请输入你需要修改的联系人的信息：" << endl;
        string name;
        cin >> name;
        int ret = whether_exist_linkman1(abs, name);
        if (ret == -1)
        {
            cout << "查无此人！" << endl;
        }
        else
        {
            int sex = 0;
            int age = 0;
            string phone;
            string address;
            cout << "请修改联系人信息：" << endl;
            cout << "请输入姓名：" << endl;
            cin >> name;
            abs->personarray[ret].person_name = name;
            cout << "请输入性别：" << endl;
            cout << "1--男" << endl;
            cout << "2--女" << endl;
            cin >> sex;
            abs->personarray[ret].person_sex = sex;
            abs->personarray[ret].person_sex == 1 ? "男" : "女";
            cout << "请输入年龄：" << endl;
            cin >> age;
            abs->personarray[ret].person_age = age;
            cout << "请输入电话：" << endl;
            cin >> phone;
            abs->personarray[ret].person_phone = phone;
            cout << "请输入住址：" << endl;
            cin >> address;
            abs->personarray[ret].person_address = address;
            cout << "修改成功！" << endl;
        }
        system("pause");
        system("cls");
    }
void clean_person(personbooks*abs)
{
    if(abs->personnumber==0)
    {
        cout<<"通讯录本来就为空！"<"puase");
        system("cls");
        return ;
    }
    cout<<"请问是否确定清空！"<"1、清空"<"2、返回"<int select;
    cin>>select;
    if(select==1)
    {
        abs->personnumber_size=0;
        cout<<"已清空通讯录！"<"pause");
    system("cls");
}
int main()
    {
        personbooks abs;//创建通讯录变量体 
        abs.personnumber_size = 0;//初始化联系人数量为零 
        int select = 0;//选择菜单指令 
        cin >> select;
        switch (select)
        {
            show_linkman_menu();//显示联系人 
        case 1:
            add_linkman(&abs);//添加联系人 
            break;
        case 2:
            show_linkman(&abs);//显示通讯录 
            break;
        case 3:
            find_linkman(&abs);//查找联系人 
            break;
        case 4:
            delete_linkman(&abs);//删除联系人 
            break;
        case 5:
            modify_linkman(&abs);//修改联系人 
            break;
        case 6:
            clean_person(&abs);//清空通讯录 
            break;
        case 0:
            cout << "欢迎下次使用！" << endl;
            system("pause");
            exit(0);
            break;
        default:
            cout << "输入有误，请重新输入！" << endl;
            system("pause");
            system("cls");
            break;
        }
        system("pause");
        return 0;
    }

• modify_linkman 函数 少了一个 花括号
• main 函数中 switch 第一个函数调用缺少case 分支

• clean_person 函数中 ， personnumber 应该是 personnumber_size

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