Help with a few programs

Question

I'm a beginner to java and i really have no clue..
I have a few programs that need to be done by tonight - been trying to make sense of it, but i dont seem to be getting anywhere.
is there anyone that can help me??
1..)
Write a program which asks the user to enter an integer, a double and a String, then prints out these lines:
The integer plus one using the increment operator.
Cast the double into an integer and print it out.
The remainder of the integer divided by the double. Cast the double into an integer first and use the remainder operator.
The String in quote marks (").
Assume the integer and the double are the dimensions of a rectangle then print the area of the rectangle (as a double).
Each output line must have an explanation. E.g.
Value of integer plus one is:
2)
Write a program which calculates a price (in $�s) then adds tax (at 15%) and P&P (Post and Packing) at $4.50.
Ask the user for a value (double)
Print out nicely the original value
Print out nicely the new value which is the original value plus tax and P&P.
3)
Write a program which asks the user to enter 3 values - a double less than 50.0, an integer greater than 5 but less than 100 and a String. (You need not bother checking these!)
Use the Random class to generate a random number between 0 and one less than the integer entered
Printout the total of multiplying together the random number, the length of the String and the double entered.
Important Information
Any help will be appreciated. Thanks

Answer 1

Uhh...
You are screwed so I will help you out with one of the first tuts I was able to make sense of.
Here is a anual interest program, it really won't be hard to edit it into Tax and it already has the input box.
public class Interest3 {
               This class implements a simple program that
               will compute the amount of interest that is
               earned on an investment over a period of
               5 years.  The initial amount of the investment
               and the interest rate are input by the user.
               The value of the investment at the end of each
               year is output.  The rate must be input as a
               decimal, not a percentage (for example, 0.05,
               rather than 5).
            public static void main(String[] args) {
                double principal;  // the value of the investment
                double rate;       // the annual interest rate
                TextIO.put("Enter the initial investment: ");
                principal = TextIO.getlnDouble();
                TextIO.put("Enter the annual interest rate: ");
                rate = TextIO.getlnDouble();
                int years = 0;  // counts the number of years that have passed
                while (years < 5) {
                   double interest = principal * rate;   // compute this year's interest
                   principal = principal + interest;     // add it to principal
                   years = years + 1;    // count the current year.
                   if (years > 1) {
                      TextIO.put("The value of the investment after ");
                      TextIO.put(years);
                      TextIO.put(" years is $");
                   else {
                      TextIO.put("The value of the investment after 1 year is $");
                   TextIO.putln(principal);
                } // end of while loop
            } // end of main()
         } // end of class Interest3So now save that as Interest3.java in a notepad doc under all files in a directory such as Tax on your desktop.
Now here's the longer one...
(I uploaded it so just click the link)
http://www.megaupload.com/?d=04SJA1J2
^^^^^
Save it as TextIO.java under all files in the "Tax" directory.
Compile it using this: (Notepad, all files, Compile.bat in tax directory)
@echo off
title Compile Tax Program
javac *.java
pauseThen run it using this: (Notepad, all files, Run.bat in tax directory)
@echo off
title Run Tax
java Interest3
pauseNow just edit the system.out.println from "Enter the initial investment" to like "Enter the amount of money"
Then "Enter the anual interest rate" to "Enter the tax amount"
Then remove the calculations for 5 years and rewrite that outprintln. If this is incorrect, as I didn't really read your entire post, I'll quickly slap together a tax program.