hello

#include<iostream>
#include<string.h>
using namespace std;
class Person
{
public:
    Person(char n[],char i[] = "",char p[] = "")
    {
        strcpy(name,n);
        strcpy(id , i);
        strcpy(phonenumber , p);
    }
    ~Person(){}
    void print()
    {
        cout << name << endl;
        cout << id << endl;
        cout << phonenumber << endl;
    }
private:
    char name[10],id[20],phonenumber[15];
};
    const int Fleshman = 1;
    const int Sophomore = 2;
    const int Junior = 3;
    const int Senior = 4;
class Student:public Person
{
public:
    Student(char n[],char i[] = "",char p[]="",int g= 0):Person( n,i,p)
    {
        grade = g;
    }
    ~Student(){}
    void print()
    {
        Person::print();
        switch ( grade )
        {
        case Fleshman: cout << "Fleshman" << endl;
            break;
        case Sophomore : cout << "Sophomore" << endl;
            break;
        case Junior:cout << "Junior" << endl;
            break;
        case Senior : cout << "Senior" << endl;
            break;
        default:cout << "error!" << endl;
            break;
        }
    }
private:
    int grade;
};
 class Mydate
{
 public:
     Mydate(int y = 0,int m = 0,int d = 0)
     {
         year = y;
         month = m;
         day = d;
     }
     ~Mydate(){}
     void print()
     {
         cout << year << " " << month << " " << day << endl;
     }
     int gety()
     {
         return year;
     }
     int getm()
     {
         return month;
     }
     int getd()
     {
         return day;
     }
     double diffYear(Mydate & ma)
     {
         int a,b,c;
         a = ( year - 1 ) * 12 + month;
         b = (ma.gety() - 1) * 12 + ma.getm();
         c =abs( b - a );
         return c/12.0;
     }
 private:
    int year;
    int month;
    int day;
};
class Employee:public Person
{
public:
    Employee(char n[],char i[]="",char p[]="",char o[]="",double s=0,int y=0,int m=0,int d=0):Person(n,i,p),datehired(y,m,d)
    {
        strcpy(office,o);
        salary = s;
    }
    ~Employee(){}
    void setsalary(double s)
    {
        salary = s;
    }
    double getsalary()
    {
        return salary;
    }
    Mydate getdate()
    {
        return datehired;
    }
    void putsalary()
    {
        cout << "salary " << salary << endl;
    }
    void print()
    {
        Person::print();
        cout << "office: " << office << endl;
        datehired.print();
    }
private:
    char office[20];
    double salary;
    Mydate datehired;
};
const int Professor = 3;
const int AssociateProfessor = 2;
const int AssistantProfessor = 1;
const double basicwages = 1000;
class Faculty:public Employee
{
public:
    Faculty(char n[],char i[]="",char p[]="",char o[]="",double s=0,int y=0,int m=0,int d=0,int r=0):Employee( n,i,p,o,s,y,m,d )
    {
        rank=r;
    }
    ~Faculty(){}
    int calsal()
    {
        double sal;
        sal = rank * basicwages;
        Employee::setsalary(sal);
        return 0;
    }
    void print()
    {
        Employee::print();
        switch(rank)
        {
        case 1 :cout << "AssistantProfessor" << endl;
            break;
        case 2 :cout << "AssociateProfessor" << endl;
            break;
        case 3 :cout << "Professor" << endl;
            break;
        default:cout << "Error!" << endl;
            break;
        }
    }
private:
    int rank;
};
const double allowance = 500;
class Staff:public Employee
{
public:
    Staff(char n[],char i[]="",char p[]="",char o[]="",double s=0,int y=0,int m=0,int d=0,char po[] = ""):Employee(n,i,p,o,s,y,m,d)
    {
        strcpy(position,po);
    }
    ~Staff(){}
    void calculate()
    {
        double s;
        Mydate mb;
        Mydate ma(2010,1,1);
        mb = Employee::getdate();
        s = basicwages + allowance * mb.diffYear( ma );
        Employee::setsalary(s);
    }
    void print()
    {
        Employee::print();
        cout << position << endl;
    }
private:
    char position[20];
};
int main()
{
    Person ren("abc","12243","1243241");
    Student tong("sdd","3143","432132",2);
    Employee em("adsf","341346","6465423","sgfd",1000,2008,11,3);
    Faculty fa("fad","53534","475453","fwedf",2000,2007,11,3,2);
    Staff st("fdsgf","47567","8769","uytu",1000,2006,11,3,"eofff");
    st.print();
    st.calculate();
    st.putsalary();
    fa.print();
    fa.calsal();
    fa.putsalary();
    em.print();
    em.putsalary();
    tong.print();
    ren.print();
    cout << "That is all!" << endl;
    return 0;
}