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Thread: Monthly mortgage payment calculator

  1. #26
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    Default Re: Monthly mortgage payment calculator

    ok when i run this program it asks questions i enter the following
    house price = 1000
    down payment = 50
    interest rate = .05
    number of payments 30
    top equation: double tempTop = ((housePrice - downPayment) * (annualInterestRate/12));
    bottom equation: double tempBottom = ((1-(1+(Math.pow(annualInterestRate/12, -numberofPayments)))));
    double monthlyPayment = (tempTop / tempBottom);



    the end results are top equation = 3.9583333333333335
    end result for bottom equation = -2.548808761537613E71 negative number
    mortgage payment = top/bottom = -1.5530130753887556E-71 negative number

  2. #27
    Super Moderator Norm's Avatar
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    Default Re: Monthly mortgage payment calculator

    You need to continue breaking the compound expressions down into single expressions and printing their values.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #28
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    Default Re: Monthly mortgage payment calculator

    what will that accomplish i dont get what your trying to do i showed you the formula and i showed you how i broke it down what else needs to be done?

  4. #29
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    Default Re: Monthly mortgage payment calculator

    what else needs to be done
    You need to find where the error is in that compound expression.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #30
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    Default Re: Monthly mortgage payment calculator

    its in bottom expression but i dont know how to fix it thats problem i can break it down all day long but something is wrong please help me!!!!!!!!!!

  6. #31
    Super Moderator Norm's Avatar
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    Default Re: Monthly mortgage payment calculator

    i can break it down all day long but something is wrong
    There aren't an infinite number of subexpressions so I expect you can do it in a few minutes.

    You need to verify that all the subexpressions are working correctly.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #32
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    Default Re: Monthly mortgage payment calculator

    i dont know how to break this line down any further
     
    double tempBottom = ((1-(1+(Math.pow(annualInterestRate/12, -numberofPayments)))));
    on paper sure in java no clue

  8. #33
    Super Moderator Norm's Avatar
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    Default Re: Monthly mortgage payment calculator

    Start on the inside and work out: aIR/12, Math.pow()
    If you don't understand my answer, don't ignore it, ask a question.

  9. #34
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    Default Re: Monthly mortgage payment calculator

    forget it im struggling for hours now and all your doing is asking me more questions. thanks for nothing its much appreciated

  10. #35
    Super Moderator Norm's Avatar
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    Default Re: Monthly mortgage payment calculator

    Sorry, if you didn't find someone to do your work for you. I thought you were interested in learning programming techniques. Among those techniques is debugging. That's what I've been suggesting that you do with your code so YOU could find what the problem with YOUR code is.

    Good luck.
    If you don't understand my answer, don't ignore it, ask a question.

  11. #36
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    Default Re: Monthly mortgage payment calculator

    i apologize just frustrated I think i figured it
    double tempBottom = ((1-(Math.pow(1+(annualInterestRate/12), -numberofPayments))));
    my 1+ was in the wrong spot, Norm you were right when i broke it completely down i saw it thanks

    --- Update ---

     
     
    import java.util.Scanner;
     
    	public class Project1 {
    	public static void main(String[] args) {
    		Scanner input = new Scanner(System.in);
     
    		System.out.println("Enter the price of the house: ");
    		double housePrice = input.nextDouble();
    		System.out.println("Enter the down payment: ");
    		double downPayment = input.nextDouble();
    		System.out.println("Enter the annual interest rate: ");
    		double annualInterestRate = input.nextDouble();
    		System.out.println("Enter the number of payments: ");
    		double numberofPayments = input.nextDouble();
     
     
    		double tempTop = ((housePrice - downPayment) * (annualInterestRate/12));
    		double tempBottom = ((1-(Math.pow(1+(annualInterestRate/12), -numberofPayments))));
    		double monthlyPayment = (tempTop / tempBottom);
     
    		System.out.println( "The price of the house is: " + housePrice);
    		System.out.println( "Your down payment is : " + downPayment);
    		System.out.println( "Your annual interest rate is :" + annualInterestRate);
    		System.out.println( "Your number of payments are: " + numberofPayments);		
    		System.out.println( "Your monthly payment is: " + monthlyPayment);
    		System.out.println( "");
    		System.out.println( "Top of equation equals: " + tempTop);
     
    		System.out.println( "Bottom of equation equals: " + tempBottom);
     
     
     
    	}	
    	}

    i think im on track please check

  12. #37
    Super Moderator Norm's Avatar
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    Default Re: Monthly mortgage payment calculator

    Glad you are making progress.
    If you don't understand my answer, don't ignore it, ask a question.

  13. #38
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    Default Re: Monthly mortgage payment calculator

    Quote Originally Posted by iamgonge View Post
    i dont know how to break this line down any further
     
    double tempBottom = ((1-(1+(Math.pow(annualInterestRate/12, -numberofPayments)))));
    on paper sure in java no clue
    Norm is trying to help you to help yourself. You can't learn something if people just give you the answer. Especially in programming. Now look at this line off code I quoted and look at how the math.pow method works. Do you see a problem.

    Norm is correct when he tells you to "continue breaking the compound expressions down into single expressions". This helps you to find if your calculations are wrong and were they are going wrong. For example :
    3*(35+(50/5)) - to break this down
    3*(35+10)
    3*45
    ANS = 135

  14. #39
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    Default Re: Monthly mortgage payment calculator

    thank you

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