C++ :: Calculate Balance Of Saving Account At The End Of Three Month Period

(I'm using visual c++). Write a program that calculates the balance of a savings account at the end of a three month
period. It should ask the user for the starting balance and the annual interest rate. A loop should then iterate once for every month in the period, performing the following:

A) Ask the user for the total amount deposited into the account during that month. Do not accept negative numbers. This amount should be added to the balance.

B) Ask the user for the total amount withdrawn from the account during that month. Do not accept negative numbers or numbers greater than the balance after the deposits for the month have been added in.

C) Calculate the interest for that month. The monthly interest rate is the annual interest rate divided by 12. Multiply the monthly interest rate by the average of that month’s starting and ending balance to get the interest amount for the
month. This amount should be added to the balance.

After the last iteration, the program should display a final report that includes the following information:

• starting balance at the beginning of the three-month period.
• total deposits made during the three months
• total withdrawals made during the three months
• total interest posted to the account during the three months
• final balance.

What I need is to solve that particular problem using a class. Here is the code solved for the problem not using a class:

#include<iostream>
using namespace std;
int main() {
double annulInterestRate,
balance,
monthlyInterestRate,

[Code] .....