Question

QUESTION

1. Write the main while loop for a Java program that processes a set of data as follows:

   Each line of the input consists of 2 numbers representing a quantity and price. Your loop should:

   1. Read in the input

   2. Calculate the tax. Tax will be 8.875% of price and will only be applicable if price is more than 110. Calculate the new price which is the price plus tax.

   3. Calculate the final price by multiplying quantity by the new price.

   4. Keep a running total of all prices

   5. Count the number of lines read in.

   E.C. Use input files.

Answer 1

Code:

import java.io.*;
import java.util.*;

class Main {
  public static void main(String[] args) {
    int  count = 0;

    try{
      File file_obj = new File("data.txt");
      Scanner myReader = new Scanner(file_obj);

      //it will iterate till last line in file
      while (myReader.hasNextLine()) {
        //it will split line into array of string 
        String[] data = myReader.nextLine().split("\\s");

        //get quantity and price from file 
        int qua = Integer.valueOf(data[0]);
        double price = Float.valueOf(data[1]);
        double final_price;

        //add tax to price if price is greater than 110
        if (price > 110)
          price = price + ((price*8.875)/100);

        //count final price
        final_price = qua * price;

        //print final price of n product
        System.out.println("New price of "+(count+1)+"th product is : "+String.format("%.2f", final_price));


        count++;
      }

      myReader.close();
    }catch (FileNotFoundException e) {
      System.out.println("File not found.");
      e.printStackTrace();
    }

    //print number of read from file
    if (count==0)
      System.out.println("\nThere are currently no record found in file.");
    else
      System.out.println("\nNumber of line read is : "+count);
  }
}

Output: