//York Li Project 1
/*Suppose that the tuition for a university is $10,000 and increases 5% every year.
Write a function that uses a loop to compute the tuition in ten years.
Write another function in the same program that computes the total cost of four year's worth of tuition starting ten years from now.
Write a driver main program to test each of your functions.
*/
#include <cstdlib>
#include <iostream>
#include <iomanip>
using namespace std;

void tuition(double [],double);		//function prototypes
double future(const double []);

int main()
{
    double yearlyIncrease[14];		//Tuition history
	yearlyIncrease[0] = 10000;		//Setting array 0 to starting tuition of $10,000
	double totalTuition;			//Total cost of four year's worth of tuition starting ten years from now
	const double rate = 0.05;		//Annual tuition increase rate

    tuition(yearlyIncrease,rate);	//Map out tuition costs for next 13 years
    totalTuition = future(yearlyIncrease);	//Calculates the total cost of four year's worth of tuition starting ten years from now

	cout<<"The tuition after 10 years is $"<<yearlyIncrease[10]<<endl;      //Accessing the 11th array to find the tuition cost of one year tens years from now.
	cout<<"The total cost for 4 year's worth of tuition starting ten years from now is"<<endl<<"$"<<totalTuition<<endl;

    system("pause");
    return 0;
}
void tuition(double history [],double rate)   //Function that uses a loop to compute the tuition in thirteen years
{
	for(int i = 1; i < 14; i++)
		history[i]=history[i-1]+history[i-1]*rate;	//Next year's tuition cost is 105% of last year's
}
double future(const double history [])	//Function that computes the total cost of four year's worth of tuition starting ten years from now
{
	double total=0;
	for(int i = 10; i < 14; i++)		//Adds up tuition 10,11,12,13 years from now
		total+=history[i];
	return total;
}