Question

I have a problem the output is supposed to be double but instead it is string
I am trying to add two double values but it is giving it as a string. I am using eclipse. Currently the program is compiling and running. If anyone have a moment I would appreciate it.Cheers guys. Here is the source code.

import java.util.Scanner;

public class FutureInvestment 
{
    public static void main(String[] args) 
    {
        Scanner input = new Scanner(System.in);

        System.out.println("Enter investment amount: ");
        double investmentAmount = input.nextDouble();

        System.out.println("Enter monthly interest rate: ");
        double monthlyInterestRate = input.nextDouble();

        System.out.println("Enter number of years: ");
        int numberOfYears = input.nextInt();

        double futureInterestValue = investmentAmount * ( Math.pow((1 + monthlyInterestRate), numberOfYears * 12));
        System.out.println("Accumulated value is: " + futureInterestValue  + investmentAmount);


    }

}

Answer 1

You need to format your output. You can use DecimalFormat or you can try the String#format function:

System.out.println(
    String.format("Accumulated value is: %.2f",
        futureInterestValue  + investmentAmount));

So you can get the 2 decimal output. Plus, I recommend to create a variable with your result, so you can turn your code into

double accumulatedValue = futureInterestValue  + investmentAmount;
 System.out.println(
    String.format("Accumulated value is: %.2f", accumulatedValue);