electricity bill generation code

 #include <iostream>

using namespace std;

class bill

{

public:

    int unit, result;

    bill()

    {

        cout << "enter units consumed\n";

        cin >> unit;

        if (unit > 0 && unit <= 100)

        {

            cout << "bill generated is Rs. " << unit * 10 << endl;

        }

        if (unit <= 200)

        {

            result = (100 * 10) + ((unit - 100) * 15);//unit-100 is for bill above 100

            cout << "bill generated is Rs. " << result << endl;

        }

        if (unit <= 300)

        {

            result = (100 * 10) + (100 * 15) + ((unit - 200) * 20);

            cout << "bill generated is Rs. " << result << endl;

        }

        if (unit > 300)

        {

            result = (100 * 10) + (100 * 15) + (100 * 20) + ((unit - 300) * 25);

            cout << "bill generated is Rs. " << result << endl;

        }

    }

};

int main()

{

    bill b;

    return 0;

}