CODEWITHSUNDEEP
java
User
User

Reputation: 1726

Why is my method returning infinity?

The fifteen.monthyPayment()); is returning infinity every time I run it. I cannot figure out why. I believe it has something to do with the years, because if I change the years value to equal a certain number, say 15, it does not return infinity. I thought the MyLoan fifteen should change it to 15 for me.

Can any body tell me why this code is returning infinity? 

public class MyLoan {

    // instance members
    private double amountBorrowed;
    private double yearlyRate;
    private int years;
    public double A;
    public double n = years * 12;

    // public instance method
    public MyLoan(double amt, double rt, int yrs) {
        this.amountBorrowed = amt;
        this.yearlyRate = rt;
        this.years = yrs;
    }

    public double monthlyPayment() {

        double i = (yearlyRate / 100) / 12;

        A = (amountBorrowed) * ((i * (Math.pow(1+i,n))) / ((Math.pow(1 + i, n))-1));
        return A;
    }


    public static void main(String[] args) {

        double RATE15 = 5.75;
        double RATE30 = 6.25;
        double amount = 10000;
    }

    MyLoan fifteen = new MyLoan(amount, RATE15, 15);

    System.out.println(fifteen.monthlyPayment());

}

Upvotes: 0

Views: 723

Answers (1)

Paul Boddington
Paul Boddington

Reputation: 37665

You need to initialise n in the constructor.

this.years = yrs;
this.n = yrs * 12;

Otherwise it uses the default value for years, which is 0.

Division by 0 is resulting in Double.POSITIVE_INFINITY.

Upvotes: 3

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