8.3 interest

#include <iostream>
using namespace std;

double calcInt (double, double, double, double&);

int main(){
	
	double deposit, ratePer, rateDec, endAmount, years, endBalance; 
	
	cout<<"Enter initial deposit: $";
	cin>>deposit;
	cout<<"Enter interest rate (%): ";
	cin>>ratePer;
	rateDec = ratePer/100;
	cout<<"Enter desired end amount: ";
	cin>>endAmount;
	
	endBalance = calcInt (deposit, rateDec, endAmount, years);
	
	cout<<"\nIt will take "<<years<<" years."
		<<"\nEnding balance = "<<endBalance;
	
	
	return (0);
}

double calcInt (double deposit, double rateDec, double endAmount, double& years){
	
	double temp=deposit;
	double endBalance;
	int n = 0;
	
	do{
		endBalance = temp+(temp*rateDec);
		temp = endBalance;
		n++;
	}while (temp <= endAmount);	
	
	years = n;
	return (endBalance);
}