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07 May 2011 @ 09:23 pm
Another C++ Program and Anniversary Day!!!  
31 months is a long time. :) 4 months and 3 days from now we will be married and partying our tushies off. As for tonight, both of us are working on school.

C++ is going well. First real test is online and due by tomorrow. I just finished my latest program. The whole purpose for this program is to show that we can use functions, and it would be a lot shorter if we didn't have explicit instructions to use functions. :/

Please feel free to check it out and give feedback if you are so inclined...

/***********************************************************************
  Description: This program shows how to use functions
***********************************************************************/

#include 
#include 
//#include 

using namespace std;

// Function declarations
double findInt(double interestRate, int yearPayments);
double loanAmaountCalc(double i, double exp, double periodicPayment);
double monthlyPaymentCalc(double i, double exp, double periodicPayment);

void main()
{
	double salary;
	double interestRate;
	int loanLength = -30;
	int yearPayments = 12;
	double periodicPayment = 0;

	// Get gross salary and interest rate from user
	cout << "Please enter your yearly gross salary: ";
	cin >> salary;
	cout << "Please enter an interest rate: ";
	cin >> interestRate;

	// Convert interest rate to decimal
	interestRate = interestRate * 0.01;

	// Determine periodicPayment
	periodicPayment = ((salary / 12) * .3);
	
	// Calculate "exp" for later use 
	double exp = -(yearPayments * loanLength);

	// Call function to calculate "i" for later use
	double i = findInt(interestRate, yearPayments);

	// Call function to calculate the monthly payment
	double monthlypayment = monthlyPaymentCalc(i, exp, periodicPayment);

	// Call function to calculate the loan amount
	double loanAmount = loanAmaountCalc(i, exp, periodicPayment);

	// Set precision to two decimals
	cout.precision(2);
	cout << fixed << showpoint;

	// Output to screen desired results
	cout << "The target (30% of monthly salary) monthly payment range is: $" << (periodicPayment - 10)
		<< " - \n$" << periodicPayment << endl;
	cout << "Your max target house price is: $" << loanAmount << endl;
	cout << "with a monthly payment of: $" << monthlypayment << endl;

	system("pause");
}

// Function for calculating "i"
double findInt(double interestRate, int yearPayments)
{
	double i = 0;
	i = interestRate / yearPayments;
	return i;
}

// Function for calculating loanAmount
double loanAmaountCalc(double i, double exp, double periodicPayment)
{
	double loanAmount = 0;
	double monthlyPayment = 0;
	while (periodicPayment > monthlyPayment && monthlyPayment < (periodicPayment - 10))
	{
		loanAmount += 1000;
		monthlyPayment = (loanAmount * i / (1 - pow((1 + i),-(exp))));
	}
	return loanAmount;
}

// Function for finding monthlyPayment
double monthlyPaymentCalc(double i, double exp, double periodicPayment)
{
	double loanAmount = 0;
	double monthlyPayment = 0;
	while (periodicPayment > monthlyPayment && monthlyPayment < (periodicPayment - 10))
	{
		loanAmount += 1000;
		monthlyPayment = (loanAmount * i / (1 - pow((1 + i),-(exp))));
	}
	return monthlyPayment;
}

 
 
Current Mood: tiredpooped patoot
 
 
 
evolutionaryshanonona on May 8th, 2011 04:41 am (UTC)
i are human.
does not compute.
strigoinewday on May 8th, 2011 04:48 am (UTC)
Re: i are human.
You are cute and that does compute. :)