Practical 10 OOP

 PRACTICAL – 10.1

Write a program to overload the + and == operators for the string class.

#include <iostream>

#include <string>

using namespace std;

class Operator_ovr

{

    string s1, s2;

public:

    void operator+()

    {

        string total;

        total = this->s1 + this->s2;

        cout << total << endl;

    }

    Operator_ovr() {}

    Operator_ovr(string one, string two)

    {

        s1 = one;

        s2 = two;

    }

    void operator==(Operator_ovr str)

    {

        if (s1 == str.s1)

            cout << "string are same";

        else

            cout << "string are not same";

    }

};

int main()

{

    Operator_ovr j("jinay", "rahi"), r("shah", "patel");

    +j;

    j == r;

    return 0;

}

PRACTICAL – 10.2

Write a program to overload the [] operator.

#include <iostream>

using namespace std;

const int SIZE = 10;

class safearay

{

private:

    int arr[SIZE];

public:

    safearay()

    {

        register int i;

        for (i = 0; i < SIZE; i++)

        {

            arr[i] = i;

        }

    }

    int &operator[](int i)

    {

        if (i > SIZE)

        {

            cout << "Index out of bounds" << endl;

            // return first element.

            return arr[0];

        }

        return arr[i];

    }

};

int main()

{

    safearay A;

    cout << "Value of A[2] : " << A[2] << endl;

    cout << "Value of A[5] : " << A[5] << endl;

    cout << "Value of A[12] : " << A[12] << endl;

    return 0;

}

PRACTICAL – 10.3

Write a program to overload the << and >> operators.

#include <iostream>

using namespace std;

class Io

{

    int age;

public:

    Io()

    {

        age = 0;

    }

    Io(int a)

    {

        age = a;

    }

    friend ostream &operator<<(ostream &output, const Io &D)

    {

        output << "Age is " << D.age << endl;

        return output;

    }

    friend istream &operator>>(istream &input, Io &D)

    {

        cout << "Enter Age : ";

        input >> D.age;

        return input;

    }

};

int main()

{

    Io jinay, kit(18);

    cin >> jinay;

    cout << jinay;

    cout << kit;

    return 0;

}