cpp-inheritance.cpp

#include <iostream>

using namespace std;

// base (parent class)
class Person {
    private:
        string name;
        string gender;
        int age;

    public:
        void setName(string n);
        void setGender(string g);
        void setAge(int a);
        void printPersonInfo();
};

void Person::setName(string n) {
    Person::name = n;
}

void Person::setGender(string g) {
    Person::gender = g;
}

void Person::setAge(int a) {
    Person::age = a;
}

void Person::printPersonInfo() {
    cout << "Your name is " << Person::name << ", you are a " << Person::gender << " who is " << Person::age << " years old\n";
}

// -- Teacher Class (derived/ child class)
class Teacher: public Person {
    private:
        string school;
        float salary;

    public:
        void setSchool(string s);
        void setSalary(float s);
        void printTeacherInfo();
};

void Teacher::setSchool(string s) {
    Teacher::school = s;
}

void Teacher::setSalary(float s) {
    Teacher::salary = s;
}

void Teacher::printTeacherInfo() {
    cout << "The teacher teaches at "<< Teacher::school << " and earns Ksh " << Teacher::salary << endl;
}

// derived/child/grandchild class
class HeadTeacher: public Teacher {
    public:
        void printStatus();
};

void HeadTeacher::printStatus() {
    cout << "I am the freaking principal\n";
}

// derived/child class
class Carpenter: public Person {
    public:
        void printWork();
};

void Carpenter::printWork() {
    cout << "I work with wood\n";
}


int main() {
    Teacher t;
    t.setSalary(800.00);
    t.setSchool("Kilimo High");
    t.printTeacherInfo();

    t.setAge(30);
    t.setName("Sam");
    t.setGender("male");
    t.printPersonInfo();

    cout << "--------------------------" << endl;
    Carpenter c;
    c.printWork();
    c.setAge(30);
    c.setGender("Male");
    c.setName("John");
    c.printPersonInfo();

    cout << "--------------------------" << endl;

    HeadTeacher h;
    h.printStatus();
    h.setSalary(1000000.0);
    h.setSchool("Molo High");
    h.printTeacherInfo();

    return 0; 
}