Future Value Calculator

[Evan Cristofori]

Hi All,

I was wondering if someone could show me an example of a future value calculator:

" F = P(1+rate)^t "

where
F = future value
P = initial deposit (principal)
rate = (annual) interest rate (expressed as a fraction, e.g. 0.06)
t = number of years invested

Also,

The user needs to be able too input each parameter:

"Please input the principal: ______"
"Please input the annual interest rate: ______"
"Please input the number of years invested: ______"

Then,

The program should run the calculator and output the information:

"The future value of your investment after ___ years is : ______"

Thanks,
Evan

[Michael Dunn]

> I was wondering if someone could show me an example of a future value calculator:

if you are a beginner, have a crack at it yourself - you'll learn more that
way (the downside is you may end up with a few self-inflicted wounds!)

if you get stuck, post a specific question and include the code you've tried.

[Evan Cristofori]

Hey,

I was going to... I just wanted to compare my results to someone elses.

Here is my code I came up with:

/**
 *The CompoundCalculatorApp class figures out the future value of an investment
 *after x years
 *
 *Author: Evan Cristofori
 *Date: 02/12/07
 *
 */
 import java.io.*;
 class CompoundCalculator {
 public static void main(String[] args)
 throws java.io.IOException {
 
 String s1, s2, s3;
 double p, r, f, rate;
 int t;
 
 InputStreamReader isr = new InputStreamReader(System.in);
 BufferedReader br = new BufferedReader(isr);
 
 System.out.print("Please input the principal: ");
 s1 = br.readLine();
 p = Double.parseDouble(s1);
 
 System.out.print("Please input the annual interest rate: ");
 s2 = br.readLine();
 r = Double.parseDouble(s2);
 
 System.out.print("Please input the number of years invested: ");
 s3 = br.readLine();
 t = Integer.parseInt(s3);
 
 rate = (1+r);
 
 f = p * Math.pow(rate, t);
 System.out.println("The future value of your investment after " + t + " years is: " + f);
 }
 }
 

How does it look?

[Jesper de Jong]

It looks good.