Practical 9 OOP

 PRACTICAL – 9.1

Construct a two-dimensional array using dynamic constructors.

#include <iostream>

using namespace std;

class matrix

{

    int d1, d2;

    int **p;

public:

    matrix(int x, int y);

    void getdata(int i, int j, int value)

    {

        p[i][j] = value;

    }

    void putdata(int i, int j)

    {

        cout << p[i][j];

        cout << " ";

    }

};

matrix ::matrix(int x, int y)

{

    d1 = x;

    d2 = y;

    p = new int *[d1]; // creates array pointer

    for (int i = 0; i < d1; i++)

    {

        p[i] = new int[d2];

    }

}

int main()

{

    int m, n, value, i, j;

    cout << "Enter the size of matrix" << endl;

    cin >> m >> n;

    matrix a(m, n);

    cout << "Enter the elements row by row" << endl;

    for (i = 0; i < m; i++)

    {

        for (j = 0; j < n; j++)

        {

            cin >> value;

            a.getdata(i, j, value);

        }

    }

    cout << "\n****************************" << endl;

    for (i = 0; i < m; i++)

    {

        for (j = 0; j < n; j++)

        {

            a.putdata(i, j);

        }

        cout << endl;

    }

}

PRACTICAL – 9.2

Write a program to overload the + and –operators for the complex class.

#include <iostream>

using namespace std;

class Operator_overloading

{

    int num;

public:

    Operator_overloading operator+(Operator_overloading &a)

    {

        Operator_overloading x;

        x.num = num + a.num;

        return x;

    }

    Operator_overloading operator-(Operator_overloading &a)

    {

        Operator_overloading x;

        x.num = num - a.num;

        return x;

    }

    void setdata()

    {

        cin >> num;

    }

    inline void getdata() { cout << num << endl; }

};

int main()

{

    Operator_overloading o, p, q, r;

    o.setdata();

    p.setdata();

    q = o + p;

    r = o - p;

    q.getdata();

    r.getdata();

    return 0;

}

PRACTICAL – 9.3

Write a program to overload the unary –operator for a suitable class.

#include <iostream>

using namespace std;

class Operator_overloading

{

    int num;

public:

    void operator-()

    {

        num = (-1) * num;

    }

    void setdata()

    {

        cin >> num;

    }

    inline void getdata() { cout << num; }

};

int main()

{

    Operator_overloading o, p;

    o.setdata();

    -o;

    o.getdata();

    return 0;

}