employee data info storing program

employee.cpp

/// just a small exercise program in c++ book that i study so if anyone encounters the same problem this
/// this program i created will do its job according to the problem
/// expect that when to input a invalid number the program will have infinite loop

#include <iostream>
#include <string>

using namespace std;

class Employee
{
private:
    int idnumber;
    double payrate;
    double numberofhours;
public:
    Employee(int = 0, double = 0.0, double = 0);
    void Delval();
    void Employeeinfo();
    void Setinfo();
    void Deleteinfo();
    int Mainmenu();
};

Employee::Employee(int idnum, double pr, double noh)
{
    idnumber = idnum;
    payrate = pr;
    numberofhours = noh;
}

void Employee::Employeeinfo()
{
    cout << "\nid number: " << idnumber
         << "\npay rate: " << payrate
         << "\nnumber of hours worked: " << numberofhours << endl;

    return;
}

void Employee::Setinfo()
{
    cout << "\nid number: ";
    cin >> idnumber;
    cout << "\npay rate: ";
    cin >> payrate;
    cout << "\nnumber of hours worked: ";
    cin >> numberofhours;

    cout << "\nregistering..... \n";

    return;
}

void Employee::Deleteinfo()
{
    char key;

    cout << "\ndelete this employee?: y or n\n";
    while(1){
        cin >> key;
        if(tolower(key) == 'y'){
             Delval();
             cout << "data was deleted: ";
             return;
        }
        else if(tolower(key) == 'n'){
            cout << "data was not deleted: ";
            return;
        }
        else{
            cout << "invalid input: ";
            continue;
        }
    }

    return;

}

void Employee::Delval()
{
     idnumber = 0;
    payrate = 0.0;
    numberofhours = 0;
}

int main()
{
    int numofperson;


    cout << "enter a number of person to register: ";
    cin >> numofperson;

    Employee a[numofperson];
    int counter = 1;
    int s = 0;
    int num;

    while(s < numofperson)
    {
        cout << "\nenter info for employee " << counter << endl;
        a[s].Setinfo();
        cout << "the info has been set for employee " << counter << endl;
        a[s].Employeeinfo();
        while(1)
        {
        cout << "\nfor employee " << counter << endl;
        cout << "\nmain menu: \n"
             << "-------- \n"
             << "1. add another employee \n"
             << "2. modify \n"
             << "3 delete this employee \n"
             << "4.display the info \n"
             << "5. exit \n" << endl;

        cin >> num;
        if(num == 1){
           s++;
           counter++;
           cout << "\nenter info for employee " << counter << endl;
           a[s].Setinfo();
           a[s].Employeeinfo();
           continue;
        }
        else if(num == 2)
        {
            cout << "\nchange the info for employee " << counter << endl;
            a[s].Setinfo();
            cout << "\nthe info has been change for employee " << counter << endl;
            a[s].Employeeinfo();
        }
        else if(num == 3)
        {
            a[s].Deleteinfo();
            continue;
        }
        else if(num == 4)
        {
            cout << "\ndisplaying the info for employee " << counter;
            a[s].Employeeinfo();
            continue;
        }
        else if(num == 5)
        {
            cout << "\nexiting the program....." << endl;
            return 0;
        }
        else
        {
            cout << "invalid input: "
                 << endl;
            continue;
        }
        }
    }





    cout << "\nmaxinum employee registered: exiting the program..."
         << endl;

    return 0;
}