Financial Application: Compound Value
The code has been modified slightly and now uploaded to the site.

213.cpp
#include <iostream>
using namespace std;
int main(){
double amount;
double monthly_interest_rate = 0.00417;
double subAmount = 0;
std::cout << "Enter the monthly saving amount: \n";
std::cin >> amount;
for (int i = 0; i < 6; i++){
subAmount = (amount + subAmount) * (1 + monthly_interest_rate);
}
std::cout << "After the sixth month, the account value is " << subAmount;
}