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9/22/2017 12:11:25 AM
Posted: 9/25/2005 12:38:24 PM EDT
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!
Link Posted: 9/25/2005 12:39:17 PM EDT
I'm game. Drop me an email or post it here.
Link Posted: 9/25/2005 12:43:10 PM EDT
I am a coding god... please send it to me and your problems will be resolved. pwitkowski@gmail.com
Link Posted: 9/25/2005 12:45:12 PM EDT
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();


}
}


Link Posted: 9/25/2005 12:47:20 PM EDT
Looks like you are never assigning a value to "tax"
Link Posted: 9/25/2005 12:49:08 PM EDT
the value of tex is never assigned, when it goes to calculate it, it goes bezerk.
Link Posted: 9/25/2005 12:49:13 PM EDT
Oh yeah, let me go back and take a look at that...
Link Posted: 9/25/2005 12:50:00 PM EDT

Originally Posted By Strats:
Looks like you are never assigning a value to "tax"



Yep.
Link Posted: 9/25/2005 12:50:29 PM EDT
What is your objective with the tax, you can either hardcode it, or have the customer insert it (doesn't make much sense).
Link Posted: 9/25/2005 12:53:04 PM EDT
It's supposed to calculate 7% sales tax based on input from the user.
Link Posted: 9/25/2005 12:54:28 PM EDT
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++;
}
}
Link Posted: 9/25/2005 12:55:01 PM EDT
The indents are messed up....
Link Posted: 9/25/2005 12:55:18 PM EDT
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.
Link Posted: 9/25/2005 12:58:00 PM EDT

Originally Posted By Illinigunner21:
The indents are messed up....



use the 'code' board tag.
Link Posted: 9/25/2005 12:58:24 PM EDT

Originally Posted By TheCynic:
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.
Link Posted: 9/25/2005 1:04:37 PM EDT
Every time I compile, it tells me :
Incompatible types found: java.lang.string
What's up with that?
Link Posted: 9/25/2005 1:08:11 PM EDT
[Last Edit: 9/25/2005 1:11:17 PM EDT by TheCynic]

Originally Posted By junebug68:
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);
}
Link Posted: 9/26/2005 8:34:50 AM EDT
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.
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