Ndtyjky

I want the Cart.txt file to be able write whatever the total sales are in the file itself. The file right now just says:

3,2,Shoes

3,4,Shirt

2,5,Car

This is the current output:

run:

Enter how many items you are buying

3

Enter the items you are buying, structured as followed 

Quantity,Price,Item Name:

3,2,Shoes

3,4,Shirt

2,5,Car

Those values were written to Cart.txt

Sold 3 of Shoes at $2.00 each. 

Sold 3 of Shirt at $4.00 each. 

Sold 2 of Car at $5.00 each. 

Total sales: $28.00

This is the code itself:

package shop;



import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.File;

import java.io.PrintWriter;

import java.util.Scanner;



public class Shop 

{



public static void main(String args)

{

    String fileName = "Cart.txt";

    PrintWriter outputStream = null;



    try

    {

        outputStream= new PrintWriter (fileName);

    }

    catch (FileNotFoundException e)

    {

        System.out.println("Error opening the file "+ fileName);

        System.exit(0);

    }



    System.out.println("Enter how many items you are buying");

    Scanner keyboard = new Scanner (System.in);

    Scanner intinput = new Scanner (System.in);

    int input = intinput.nextInt();



    System.out.println("Enter the items you are buying, structured as followed"

            + " nQuantity,Price,Item Name:");





    for(int count=1; count<=input; count++)

    {

        String line = keyboard.nextLine();

        outputStream.println(line);



    }



    outputStream.close();

    System.out.println("Those values were written to "+ fileName);



    try

    {

        Scanner inputStream = new Scanner(new File(fileName));

        String line = inputStream.toString();

        double total = 0;

    for(int count=1; count<=input; count++)

    {



            line = inputStream.nextLine();

            String ary = line.split (",");

            int quantity = Integer.parseInt (ary[0]);

            double price = Double.parseDouble(ary[1]);

            String description = ary[2];

            System.out.printf("Sold %d of %s at $%1.2f each. n",

                    quantity, description, price);

            total += quantity * price;  



    }



        System.out.printf("Total sales: $%1.2fn", total);

        inputStream.close();



    }

    catch (FileNotFoundException e)

    {

        System.out.println("Cannot find file " + fileName);

    }

    catch (IOException e)

    {

        System.out.println("Problem with input file " + fileName);

    }



}

}

Perform the following :

1. Write to the file after calculating the total :
   outputStream.println(total);
   


2. Close the outputStream after writing the total to the file

EDIT:

Make the following changes in this block of code :

    System.out.println("Enter the items you are buying, structured as 

                        followed" + " nQuantity,Price,Item Name:");

    double tot = 0.0;

    for (int count = 1; count <= input; count++) {

        String line = keyboard.nextLine();

        outputStream.println(line);

        String arr = line.split(",");

        tot += (Integer.parseInt(arr[0]) * Double.parseDouble(arr[1]));

    }

    outputStream.println("Total sales: $" + tot);

    outputStream.close();

    System.out.println("Those values were written to " + fileName);

Here we calculate the total for all entries and then just write it once to the file.

Output

3,2,Shoes

3,4,Shirt

2,5,Car

Total sales: $28.0

I would keep a running total and then add it in at the end:

Double total = 0; 



for(int count=1; count<=input; count++)

        {

            String line = keyboard.nextLine();

            outputStream.println(line);

            String arr= line.split(",");

            total += (Double.parseDouble(arr[0]) * Double.parseDouble(arr[1]));

        }

outputStream.println("Total: " + total);