Java Mortgage Calculator

Java
1

Hey there!

I was doing the java course with Mosh and I had to do the Mortgage Calculator. I’ll copy the code in this Topic as I had some trouble with it…

As far as I know, when you use “float variable = nextFloat()” you can input a decimal in the terminal, such as 1.1. As you can see in that code, I do that but for some reason I can’t input decimal numbers on that section.

I hope you guys can help me.

Also, if there’s a cleaner way to share code definitely let me know!

package me.oriol;

import java.text.NumberFormat;
import java.util.Scanner;

public class Main {

public static void main(String[] args) {
    final byte MONTHS_IN_YEAR = 12;
    final byte PERCENT = 100;

    int principal;
    double monthlyInterest;
    int numberOfPayments;

    Scanner scanner = new Scanner(System.in);

    while (true) {
        System.out.print("Principal ($1k - $1M): ");
        principal = scanner.nextInt();

        if ( principal >= 1000 && principal <= 1_000_000 )
            break;
        System.out.println("Enter a number between 1,000 and 1,000,000.");
    }

    while (true) {
        System.out.print("Annual interest Rate: ");
        double annualInterest = scanner.nextFloat();

        if ( annualInterest > 0 && annualInterest <= 30 ) {
            monthlyInterest = annualInterest / MONTHS_IN_YEAR / PERCENT;
            break; }
        System.out.println("Enter a value between 1 and 30.");
    }

    while (true) {
        System.out.print("Period (Years): ");
        byte years = scanner.nextByte();

        if ( years > 0 && years <= 30 ) {
            numberOfPayments = years * MONTHS_IN_YEAR;
            break; }
        System.out.println("Enter a value between 1 and 30");
    }

    double mortgage = principal
            * ( monthlyInterest * Math.pow( 1 + monthlyInterest, numberOfPayments )
            / ( Math.pow( 1 + monthlyInterest, numberOfPayments) - 1 ));

    String mortgageCurrency = NumberFormat.getCurrencyInstance().format(mortgage);
    System.out.println("Mortgage: " + mortgageCurrency);
}

}

2

To clarify, what error or output are you getting and what did you expect? Ideally including whatever input you are providing.

3

Hii dude,

Replace the double datatype to float in monthlyInterst

int principal;
float monthlyInterest;
int numberOfPayments;

Then you will able to apply decimal numbers

You also need to that in monthly interest while loop

4

Well, this was more of a sharing issue actually, coz i sent the wrong code. In my code I had it like you told me. Luckily, though, I figured the issue out… I needed to input “1,1” instead of “1.1” because I was doing it with € instead of $. So ye, that was a typing issue, thanks!

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