Question

Java program compiled but not running as expected

Asked by: Valisha

the goal of this progam is to prompt the user for a file name, and then an output name. The input text file  has to be in the same folder as the compiled java file. I want the user to first specify a input file than an output file. Than choose a unit price which will be calculated with the integers in the input file than  the calculations will appear in the output file like i specified below and this is what the values look like in the input file. And lastly I want the total  sales to be calculated.


input file

45
27 118
0
51
0
15
-8
101
56

output file

45 units at $175.26 per unit = $7886.66

27 units at $175.26 per unit = $4731.99

118 units at $175.26 per unit = $20680.56

51 units at $175.26 per unit = $8938.21

15 units at $175.26 per unit = $2628.88

The total sales are $44866.30


// File: CalculateSales.java
// Author: Valisha Powell
// Course: CSC 211
// Purpose: Write a program that computes sales of items found in a file, outputting the results to a different file.
 
 
import java.io.*;
import java.util.*;
 
public class CalculateInput
{
	public static void main(String[] args)
		throws FileNotFoundException
 
 
	{
 
 
			double saleAmount,totalSales;
		    String code = new String();
	        String nameOfFile;
	        String nameOfOut;
	        double nameOfUnit;
 
 
 
	System.out.println(" This program will compute sales from an input file you specify,");
    System.out.println(" placing the results in the output file of your choice.");
 
 
 
			Scanner inScan = new Scanner(System.in);
 
 
			System.out.print("Enter the name of the input file: ");
			nameOfFile = inScan.next();
 
			System.out.print("Enter the name of the output file:");
			 nameOfOut = inScan.next();
 
 
			Scanner fileScan = new Scanner(
								new FileReader(nameOfFile));
		PrintWriter outFile = new PrintWriter(nameOfOut);
 
         System.out.print("Enter the Unit Price:");
         nameOfUnit = inScan.nextDouble();
 
      if   (nameOfUnit <=  0 && nameOfUnit > 1000)
 
	  			{
	  				System.out.println("Enter a positive integer or 0, not grater than 1000: ");
 
	  			}
 
 
 
 
         while (!code.equals("quit"))
		{
			code = fileScan.next();
			code = code.toLowerCase();
			if (!code.equals("quit"))
			{
				saleAmount = fileScan.nextDouble();
 
 
				totalSales = saleAmount * nameOfUnit;
 
 
 
 
				outFile.printf(code +"units at:\t$%8.2f\n", nameOfUnit + " per unit = units at:\t$%8.2f\n", + totalSales);
 
				outFile.println();
 
 
			}
		}
         fileScan.close();
		outFile.close();
 
        System.out.println("Thank you");
        System.out.println("The program will now process the units sold in" + nameOfFile);
        System.out.println("using a unit price of" + nameOfUnit);
 
  }
 
}

                                  
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Asked On
2009-02-26 at 20:44:55ID24182745
Tags

JAVA

Topic

Java Programming Language

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: humanonomicsPosted on 2009-02-26 at 20:51:24ID: 23752782

what exactly the problem you are getting?

is the problem that your program did not calculate the values for 101and 56?

 

by: ValishaPosted on 2009-02-26 at 21:02:24ID: 23752854

inside the c:\ after the prompt for units were displayed
I enter 5 and pressed enter the error message below appeared
exception in thread "main" java util illegal conversion exception is != java.lang

 

by: objectsPosted on 2009-02-26 at 21:08:23ID: 23752877

>                                 outFile.printf(code +"units at:\t$%8.2f\n", nameOfUnit + " per unit = units at:\t$%8.2f\n", + totalSales);

you're using a number format but passing it a string
should be more like:


                                outFile.printf(code +"units at:\t$%8.2f\n per unit = units at:\t$%8.2f\n", nameOfUnit,  totalSales);

 

by: ValishaPosted on 2009-02-26 at 21:12:55ID: 23752898

now I got the error message
in the C:\
Exeception in thread main java util.input mismatch Exception

 

by: humanonomicsPosted on 2009-02-26 at 21:35:39ID: 23752980

One problem I see is below

line 61 and line 65 you are executing filescan.next twice, because of which the input numbers are skipped. and you get the exception of mismatch

 

by: humanonomicsPosted on 2009-02-26 at 21:43:58ID: 23753009

Try the following code, it works fine. you will have to add the totalling mechanism though

// File: CalculateSales.java
// Author: Valisha Powell
// Course: CSC 211
// Purpose: Write a program that computes sales of items found in a file, outputting the results to a different file.
 
import java.io.*;
import java.util.*;
 
public class CalculateInput
{
	public static void main(String[] args) throws FileNotFoundException
 
	{
 
		double saleAmount, totalSales;
		String code = new String();
		String nameOfFile;
		String nameOfOut;
		double nameOfUnit;
 
		System.out
				.println(" This program will compute sales from an input file you specify,");
		System.out
				.println(" placing the results in the output file of your choice.");
 
		Scanner inScan = new Scanner(System.in);
 
		System.out.print("Enter the name of the input file: ");
		nameOfFile = inScan.next();
 
		System.out.print("Enter the name of the output file:");
		nameOfOut = inScan.next();
 
		Scanner fileScan = new Scanner(new FileReader(nameOfFile));
		PrintWriter outFile = new PrintWriter(nameOfOut);
 
		System.out.print("Enter the Unit Price:");
		nameOfUnit = inScan.nextDouble();
 
		if (nameOfUnit <= 0 && nameOfUnit > 1000)
 
		{
			System.out
					.println("Enter a positive integer or 0, not grater than 1000: ");
 
		}
		while (!code.equals("quit"))
		{
			code = fileScan.next();
			code = code.toLowerCase();
			if (!code.equals("quit"))
			{
				saleAmount = Double.parseDouble(code);
 
				totalSales = saleAmount * nameOfUnit;
				outFile.printf(code +"units at:\t$%8.2f\n per unit = units at:\t$%8.2f\n", nameOfUnit,  totalSales);
 
				outFile.println();
 
			}
		}
		fileScan.close();
		outFile.close();
 
		System.out.println("Thank you");
		System.out.println("The program will now process the units sold in"
				+ nameOfFile);
		System.out.println("using a unit price of" + nameOfUnit);
 
	}
 
}

                                              
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