Untitled

Polymorphism

Task 1: https://www.educative.io/courses/learn-cpp-from-scratch Complete the following exercises from the above link: Polymorphism & Virtual Functions

Task 2: ● C++ Program to demonstrate Run time polymorphism

#include <iostream>
using namespace std;
class practice
{
public:
    void display()
    {
        cout << "Called from the base class \\n";
    }
};
class practice1 : public practice
{
public:
    void display()
    {
        cout << "Called from the derived class \\n";
    }
};
int main()
{
    practice p;
    practice1 p1;
    p.display();
    p1.display();
}

● C++ Program to illustrate the use of pure virtual function in Polymorphism

#include <iostream>
using namespace std;
class practice
{
public:
    virtual void display()
    {
        cout << "Display using virtual in parent class \\n";
    }
    void print()
    {
        cout << "Print in parent class \\n";
    }
};
class practice1 : public practice
{
public:
    void display()
    {
        cout << "Display in child class \\n";
    }
    void print()
    {
        cout << "Print in child class \\n";
    }
};
int main()
{
    practice *p;
    practice1 p1;
    p = &p1;
    p->display();
    p->print();
}

Task 3:

● C++ Program to define an Abstract Class in Polymorphism

#include <iostream>
using namespace std;
class EmpDB
{
public:
    string name;
    char code;
    float pay;
    int exp;
    void getdata()
    {
        cout << "\\n=======GETDATA IN=======";
        cout << "\\nEnter name :- ";
        cin >> name;
        cout << "\\nEnter code :- ";
        cin >> code;
        cout << "\\nEnter Pay amount :- ";
        cin >> pay;
        cout << "\\nEnter experience in yrs :- ";
        cin >> exp;
        cout << "\\n\\n";
    }
    void display()
    {
        cout << "\\n=======DISPLAY DETAILS=======";
        cout << "\\nNAME :- " << name;
        cout << "\\nCODE :- " << code;
        cout << "\\nPAY :- " << pay;
        cout << "\\nEXPERIENCE :- " << exp;
        cout << "\\n\\n";
    }
    void update(string inp_name)
    {
        name = inp_name;
    }
    void update(char inp_code)
    {
        code = inp_code;
    }
    void update(float inp_pay)
    {
        pay = inp_pay;
    }
    void update(int inp_exp)
    {
        exp = inp_exp;
    }
};
int main()
{
    EmpDB emp1;
    int cont = 1, choice;
    while (cont)
    {
        cout << "\\n=======EMPLOYEE DATABASE=======";
        cout << "\\n\\nChoose Operation that you want to perform";
        cout << "\\n1 Create Record\\n2 Display Record\\n3 Update Record\\n4 Exit";
        cout << "\\nEnter your choice ";
        cin >> choice;
        switch (choice)
        {
        case 1:
            emp1.getdata();
            break;
        case 2:
            emp1.display();
            break;
        case 3:
            int upd_choice;
            cout << "\\n=======UPDATE DETAILS=======";
            cout << "\\nChoose detail you want to update";
            cout << "\\n1) NAME\\n2) CODE\\n3) PAY\\n4) EXPERIENCE";
            cout << "\\nEnter your choice :- ";
            cin >> upd_choice;
            if (upd_choice == 1)
            {
                string n1;
                cout << "\\n\\nEnter your name :- ";
                cin >> n1;
                emp1.update(n1);
            }
            else if (upd_choice == 2)
            {
                char c1[2];
                cout << "\\n\\nEnter your code :- ";
                cin >> c1;
                emp1.update(c1);
            }
            else if (upd_choice == 3)
            {
                float p1;
                cout << "\\n\\nEnter your pay :- ";
                cin >> p1;
                emp1.update(p1);
            }
            else if (upd_choice == 4)
            {
                int e1;
                cout << "\\n\\nEnter your experience :- ";
                cin >> e1;
                emp1.update(e1);
            }
            break;
        case 4:
            cont = 0;
        }
    }
}

● C++ Program to illustrates the use of Virtual base class

#include <iostream>
using namespace std;
class shape
{
public:
    int width;
    int height;
    int base;

    virtual void area() = 0;
};
class rect : public shape
{
public:
    void area()
    {
        cout << "\\nArea of rectangle is " << width * height;
    };
};
class tri : public shape
{
public:
    void area()
    {
        cout << "\\nArea of triangle is " << (height * base) / 2;
    };
};
int main()
{
    rect r1;
    cout << "\\nEnter the length and width of rectangle :- ";
    cin >> r1.width >> r1.height;
    r1.area();
    tri t1;
    cout << "\\nEnter the height and base of triangle :- ";
    cin >> t1.base >> t1.height;
    t1.area();
}