calculating interest over 5 years interest code 25jan17

// ConsoleApplication3.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "stdafx.h"
#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main()
{

    double loanamount = 100;

    double interestrate = .05;
    double paybackamount = 0;
    double length;
    int i;
    for (int i = 0; i < 5; i++)
    {

        paybackamount += (loanamount*interestrate);
    }
    paybackamount += loanamount;
        cout << "you owe your friend " << paybackamount << endl;


system("pause");

return 0;


}