I'm taking a JAVA programming class this semester, and I'm trying to straighten out a program I have written. I will post the code or IM it to anyone who thinks they can help. Thanks in advance!

I'm game. Drop me an email or post it here.

I am a coding god... please send it to me and your problems will be resolved.  [email protected]

Here's the code. I know I'm doing something stupid, but I cant figure out what:
/*
Lab 2: Bill's Burgers
Programmer: J. Eyster
Date: September 21, 2005
Filename: BillsBurgers.java
Purpose:This program will generate the total cost of food order
       and calculate 7% sales tax.
*/

import java.io.*;
import java.awt.*;
import javax.swing.*;

public class BillsBurgers
{
public static void main (String[] args) throws IOException
{
String bill;
String taxamount;
double total;
double tax;
double totalplustax;


BufferedReader dataIn = new BufferedReader(new
InputStreamReader(System.in));

//prompt and get input
System.out.println("BILL'S BURGERS TAX AND TOTAL CALCULATOR");

System.out.println();
System.out.print("Enter total of order:");
total = dataIn.readLine();

//calculations
totalplustax = total*tax;

//output
System.out.println();
System.out.println("Your total with tax is"+ Math.round(totalplustax)+".");
System.out.println();


}
}

Looks like you are never assigning a value to "tax"

the value of tex is never assigned, when it goes to calculate it, it goes bezerk.

Oh yeah, let me go back and take a look at that...

Quoted: Looks like you are never assigning a value to "tax"

Yep.

What is your objective with the tax, you can either hardcode it, or have the customer insert it (doesn't make much sense).

It's supposed to calculate 7% sales tax based on input from the user.

BTW here's a little number I'm working on.... in C++ though.



//datedItems.def
//Written September 24, 2005
//Author: Peter xxxxxx
//A class representing a collection of pairs consisting of a
//      date and item objects

#include "datedItems.h"
#include <iostream>
using std::cout;
using std::endl;

//Constructor
//Initializes our datedItems object to an empty collection
template <class Etype>
DatedItems<Etype>::DatedItems() : vectorPairs(), listPairs()
{
//no code required in constructor
}

//addItem
//Parameters: Etype param1: a generic type object that we are attempting to add
//            Date param2:  a date object which we are attemping to add
//If both parameters are unique, and not found in our collection, we will add
//         this pair of of datedItems.
template<class Etype>
void DatedItems<Etype>::addItem(Etype param1, Date param2)
{
  bool found=false;
  vectorStart = vectorPairs.begin();
  vectorFinish = vectorPairs.end();
  collectStart = listPairs.begin();
  collectFinish = listPairs.end();
  pair <Etype, Date> pair1(param1,param2);
  vectorFound = findItem (vectorStart, vectorFinish, param2, dateIsEqual);
  while (vectorStart!=vectorFinish)
  {
    if ((!(vectorFound==vectorFinish)) || (vectorStart->first==param1))
    {
       Warn("addItem: parameters not unique!");
       found=true;
       vectorStart=vectorFinish;
    }
    else
    {
       vectorStart++;
    }
  }
  if (!found)
  {
     vectorPairs.push_back(pair1);
     DateGreater<Etype> dateIsGreater(param2);
     collectFound=findFirstSatisfier(collectStart, collectFinish, dateIsGreater
);
     listPairs.insert(collectFound,pair1);
  }
}
 
//redateItem
//Parameters:  date: old date object which we want to change
//             redate:  the date which we want to set to the object  
//Replaces a date of an item to another one should the old date be found
template <class Etype>
void DatedItems<Etype>::redateItem(Date date, Date redate)
{
  collectStart = listPairs.begin();
  collectFinish = listPairs.end();      
  collectFound = collectStart;

  collectFound = findItem(collectStart, collectFinish, date, dateIsEqual);
  if (collectFound==collectFinish)
  {
     Warn("redateItem: old date not in collection!");
     return;
  }
  collectFound = findItem(collectStart, collectFinish, redate, dateIsEqual);
  if (!(collectFound==collectFinish))
  {
     Warn("redateItem: new date already in collection!");
     return;
  }  
 

  vectorStart = vectorPairs.begin();
  vectorFinish = vectorPairs.end();
  vectorFound = findItem(vectorStart, vectorFinish, date, dateIsEqual);
  if (!(vectorFound==vectorFinish))
  {
     vectorFound->second=redate;
  }

  collectStart = listPairs.begin();
  collectFound = findItem(collectStart, collectFinish, date, dateIsEqual);
     
  pair<Etype, Date> pairTemp(collectFound->first, redate);
  listPairs.erase(collectFound);
  DateGreater<Etype> dateIsGreater(redate);
  collectFound = findFirstSatisfier(collectStart, collectFinish, dateIsGreater)
;
  listPairs.insert(collectFound, pairTemp);
}  
 

//retrieveItem
//Parameters: paramDate: date for the item we are attempting to retrieve
//Returns a generic item at a given date
//Seeks the current collection for the date given, and returns the item at the
//    date
template <class Etype>
Etype DatedItems<Etype>::retrieveItem(Date paramDate)

  vectorStart = vectorPairs.begin();
  vectorFinish = vectorPairs.end();
  vectorFound = findItem(vectorStart, vectorFinish, paramDate, dateIsEqual);
  if (vectorFound==vectorFinish)
  {
     Assert("retrieveItem: date does not exist in collection!");
  }
  else
  {
     return vectorFound->first;
  }

}

//retrieveDate
//Parameters: A generic item for which the collection will be searched
//Returns a date object at a given item
//Seeks the current collection for the given item and returns the date at that
//     given item
template <class Etype>
Date DatedItems<Etype>::retrieveDate(Etype param)
{
  vectorStart = vectorPairs.begin();
  vectorFinish = vectorPairs.end();
  while (vectorStart != vectorFinish)
  {
     if (param==vectorStart->first)
     {
        return vectorStart->second;
     }
     else
     {
        vectorStart++;
     }
  }  
  Assert("retrieveDate: item does not exist in collection!");

}
 
//numPairs
//This function simply returns the amount of datedItems in our collection
template <class Etype>
int DatedItems<Etype>::numPairs() const
{
  return vectorPairs.size();
}

//printShortDates
//This fucntion simply prints out the dates in a specific format in the order
//   which they were added
template <class Etype>
void DatedItems<Etype>::printShortDates()
{
  vectorStart = vectorPairs.begin();
  vectorFinish = vectorPairs.end();
  PrintDateWithSlashes<Etype> printSlashes;
  print(vectorStart, vectorFinish, printSlashes);

}

//printAll
//This function prints all the datedItems in chornological order
template <class Etype>
void DatedItems<Etype>::printAll()
{
  collectStart = listPairs.begin();
  collectFinish = listPairs.end();
  PrintDateWithMonthName<Etype> printMonthName;
  while (collectStart != collectFinish)
  {
     printMonthName(*collectStart);
     cout<<collectStart->first<<endl;
     collectStart++;
  }
}

The indents are messed up....

Other guys got it for you.

One suggestion: you're going to get more out of the class
if you go into it learning object-oriented programming.
What you wrote, while correct, is straight procedural code
much like standard C.

Quoted: The indents are messed up....

use the 'code' board tag.

Quoted: Other guys got it for you. One suggestion: you're going to get more out of the class if you go into it learning object-oriented programming. What you wrote, while correct, is straight procedural code much like standard C.

Object orientated programming is life for me now, aside from a few generic classes like the one I wrote above.

Every time I compile, it tells me :
Incompatible types found: java.lang.string
What's up with that?

Quoted: Every time I compile, it tells me : Incompatible types found: java.lang.string What's up with that?

You need to parse the input as a double since it comes
in as a string. Look at the API for Double.parse(String)

eta:

try {
    total = Double.parseDouble(dataIn.readLine());
} catch (NumberFormatException nfx) {
    System.out.println("Input is not a number.");
    nfx.printStackTrace();
    System.exit(1);
}

junebug68,
 Just as some advice, when you are debugging your code, print out values for variables. Had you done that, you would have figured out the problem yourself.