Practical 8 OOP

 PRACTICAL – 8.1

Create a class sample with members a and b of type integer. Write a friend function that takes an object as argument and calculates the mean of the two members.

#include <iostream>

using namespace std;

class Frnd;

void mean(Frnd &a);

class Frnd

{

    int a, b;

public:

    void setdata()

    {

        cout << "Enter Two Numbers : ";

        cin >> a >> b;

    }

    friend void mean(Frnd &a);

};

void mean(Frnd &a)

{

    cout << "Mean is " << (a.a + a.b) / 2;

}

int main()

{

    Frnd f1;

    f1.setdata();

    mean(f1);

    return 0;

}

PRACTICAL – 8.2

Create  a  class  complex  that  has  two  members  of  type  float.  Write  a  friend  function  that calculate the sum of the two complex objects and returns the result as an object. Demonstrate the working using a main function.

#include <iostream>

using namespace std;

class Complex;

Complex Sum_complex(Complex &r, Complex &j);

class Complex

{

    float num1, num2;

public:

    Complex()

    {

        num1 = 0;

        num2 = 0;

    }

    Complex(float a, float b)

    {

        num1 = a;

        num2 = b;

    }

    void getdata()

    {

        cout << num1 << " + i" << num2 << endl;

    }

    friend Complex Sum_complex(Complex &r, Complex &j);

};

Complex Sum_complex(Complex &r, Complex &j)

{

    Complex sum;

    sum.num1 = r.num1 + j.num2;

    sum.num2 = r.num1 + j.num2;

    return sum;

}

int main()

{

    Complex c1(1.1, 2.2), c2(1.4, 1), c3;

    c3 = Sum_complex(c1, c2);

    c1.getdata();

    c2.getdata();

    c3.getdata();

    return 0;

}

PRACTICAL – 8.3

For the complex Class, demonstrate the use of multiple constructors.Write a program to demonstrate the use of copy constructor.

#include <iostream>

using namespace std;

class Cpy_constructor

{

    int a;

public:

    Cpy_constructor()

    {

        a = 0;

    }

    Cpy_constructor(int x)

    {

        a = x;

    }

    Cpy_constructor(Cpy_constructor &x)

    {

        a = x.a;

    }

    void display()

    {

        cout << a << endl;

    }

};

int main()

{

    Cpy_constructor j;

    j.display();

    Cpy_constructor i(3);

    i.display();

    Cpy_constructor k(i);

    k.display();

    return 0;

}