Java Calculate Future Investment Amount

I do not know where I'm going wrong here. Pleaqse take a look and let me know what suggestions you have. Thank you. #So Frustrated

import java.util.Scanner;

public class FutureInvestment {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner input = new Scanner(System.in);

//Obtain Investment Amount a

System.out.println("Enter investment amount: ");

double a = input.nextDouble();

//Obtain Interest Rate r

System.out.println("Enter interest rate: ");

double r = input.nextDouble();

//Obtain number of Years y

System.out.println("Enter number of years: ");

double y = input.nextDouble();

//Compute Future Investment Amount f

double f = a * Math.pow(1 + r, (y * 12));

//Display result

System.out.println("Accumulated value is " + f);

}

}

OUTPUT IS...........................

Enter investment amount:

1000

Enter interest rate:

.0425

Enter number of years:

1

Accumulated value is 1647.8313602236476

Re: Java Calculate Future Investment Amount

We have no idea what is wrong unless you tell us. Are you getting incorrect output? Then you should post what you expect the output should be. If it is wrong then most likely your equation is incorrect. Where did you get it? Are you sure you entered it into your code correctly?

Re: Java Calculate Future Investment Amount

Expected Output is:

Enter investment amount: 1000

Enter annual interest rate: 4.25

Enter number of years: 1

Accumulated value is 1043.34

Actual OUTPUT IS...........................

Enter investment amount: 1000

Enter interest rate: .0425

Enter number of years: 1

Accumulated value is 1647.8313602236476

Re: Java Calculate Future Investment Amount

There is a difference between 4.25 and .0425 , please correct your input data and validate the output. If the equation you are using is correct then you should get the same output.

Re: Java Calculate Future Investment Amount

Enter investment amount:

1000

Enter interest rate:

4.25

Enter number of years:

1

Accumulated value is 4.384414858452464E11

The r must be input .01...etc

How do I do a Hard Truncate the output in this Java code after the second decimal?

Please help Me. My instructions are at the bottom.

import java.util.Scanner;

public class FutureInvestment {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner input = new Scanner(System.in);

//Obtain Investment Amount a

System.out.println("Enter investment amount: ");

double a = input.nextDouble();

//Obtain Monthly Interest Rate r

System.out.println("Enter interest rate: ");

double r = input.nextDouble();

//Obtain number of Years y

System.out.println("Enter number of years: ");

double y = input.nextDouble();

double f = a * Math.pow(1 + (r/12),(y *12));

//Display result

System.out.println("Accumulated value is " + f);

}

}

OUTPUT IS

Enter investment amount: 1000

Enter interest rate: .0325

Enter number of years: 1

Accumulated value is 1032.9885118105894

I want it to say 1032.98

Re: How do I do a Hard Truncate the output in this Java code after the second decimal

Have a read of the options discussed in Oracle's Tutorial: Formatting Numeric Print Output (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)

Quote:

Accumulated value is 1032.9885118105894

I want it to say 1032.98

This sort of rounding where you simply truncate (== throw away insignificant digits) can be done using a RoundingMode.

Code:

`import java.math.RoundingMode;`

import java.text.DecimalFormat;

public class Test {

public static void main(String[] args) {

DecimalFormat fmt = new DecimalFormat(".000");

fmt.setRoundingMode(RoundingMode.DOWN);

// prints 3.141

System.out.println(fmt.format(Math.PI));

}

}

In this context "DOWN" means "towards zero". Notice that pi is actually closer to 3.142 than it is to 3.141.

Re: Java Calculate Future Investment Amount

Don't start a new thread for what is essentially a follow-on question, and moreover one which you already asked in the first thread. I've merged the two threads.

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