//Loan Demo Program, Prof Barimani
//ProgII class
//Translate to C++
//
#include <iostream>
#include <cmath>
#include <iomanip>
#include <string>
using namespace std;

int main()
{
	cout<<"Enter Loan Amount? ";
	double loan;
	cin>>loan;
	if (loan <0)
		cout<<"Loan must be positive\n";
	else
	{
		cout<<"Enter annual interest Rate%? ";
		double AIR;
		cin>>AIR;
		AIR/=100;
		if (AIR <0)
			cout<<"AIR cannot be negative\n";
		else
		{
            		cout<<"1. Month  2. Year? ";
			string ans;
			cin>>ans;
			int month; //should also check to see if Month is positive
			if (ans == "2")
			{	
				cout<<"Enter period in Years? ";
				cin>>month;
				month*=12;
			}
			else
			{	
				cout<<"Enter period in Month? ";
				cin>>month;			
			}				
			double MIR= AIR /12.0;
		    	double MP= (loan * MIR)/ (1.0- pow(1.0+MIR, -month));
			cout<<"Monthly payment= "<<MP<<" based on loan amount of $"<<loan<<" and AIR of "<<AIR*100<<"% for  "<<month<<" months\n";
		}
	}
	system("PAUSE");
	return 0;
}