Let's make some simple programs!

Because I know that half of /prog/ can't program, let's make simple ones!

---------------------- MySavings.java ----------------------

/**
 * @(#)MySavings.java
 *
 * MySavings application
 *
 * @author Tim H
 * @version 1.00 2010/5/7
 */
 
import java.util.Scanner;

public class MySavings {
   
    public static void printInterface() {
        System.out.print(
            "1. Show total in bank.\n" +
            "2. Add a penny.\n" +
            "3. Add a nickel.\n" +
            "4. Add a dime.\n" +
            "5. Add a quarter.\n" +
            "6. Take money of out bank.\n" +
            "Enter 0 to quit.\n" +
            "Enter your choice: "
            );
    }
   
    public static void main(String[] args) {
       
        Scanner input = new Scanner(System.in);
        int choice = 1;
        int moneyChoice = 0;
        double amount = 0;
       
        PiggyBank bank = new PiggyBank();
       
        while(choice > 0){
            printInterface();
            choice = input.nextInt();
           
            switch(choice){
                case 0: System.out.println("(c)Tim H 2010\nHave a nice day!"); break;
                case 1: System.out.println("Your current total is: " + bank.GetTotal()); break;
                case 2:
                case 3:
                case 4:
                case 5: moneyChoice = choice - 2; bank.AddMoney(moneyChoice); break;
                case 6:
                    System.out.print("Enter the amount you wish to withdraw: ");
                    amount = input.nextDouble();
                    bank.SubtractTotal(amount);
                    break;
                default:
                    System.out.println("Please enter a choice between 1-6!");
                    break;
            }
               
        }
---------------------- PiggyBank.java ----------------------


class PiggyBank {
    double total;
   
   
    public PiggyBank(){
        total = 100;
    }
   
    public void AddMoney(int choice){
        switch (choice) {
            case 0:
                total += 0.01;
                System.out.println("One penny added to total!\nYour total is now: " + total);
                break;
            case 1:
                total += 0.05;
                System.out.println("One nickel added to total!\nYour total is now: " + total);
                break;
            case 2:
                total += 0.10;
                System.out.println("One dime added to total!\nYour total is now: " + total);
                break;
            case 3:
                total += 0.25;
                System.out.println("One quarter added to total!\nYour total is now: " + total);
                break;
           
        }
    }
   
    public double GetTotal(){
        return total;
    }
   
    public void SubtractTotal(double amount){
        total -= amount;
        System.out.println(amount + " has been subtracted from your total!\nYour total is now: " + total);
    }
}

    }
   
}

>>33
Too bad that by the time you get to fact(100) the error of that approximation is up to about 6.9 x 10¹⁴⁴.

(Exactly 6900274882930203761252337810247937431593403625973980018479912680937406453445938682543730846893682459286692158877000328163287360910292339254099968, actually)