Using a text editor, create a file that contains a list of at least 15 six-digit account numbers. Read in each account number and display whether it is valid. An account number is valid only if the last digit is equal to the remainder when the sum of the first five digits is divided by 10. For example, the number 223355 is valid because the sum of the first five digits is 15, the remainder when 15 is divided by 10 is 5, and the last digit is 5. Write only valid account numbers to an output file, each on its own line. Save the application as ValidateCheckDigits. java.

Explanation:

The following code is written in Java. It reads every input and checks to see if it is valid. If it is it writes it to the output file.

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Scanner;

class {

           public static void main(String[] args) {

               try {

                   File myObj = new File("C:/Users/Gabriel2/AppData/Roaming/JetBrains/IdeaIC2020.2/scratches/input.txt");

                   Scanner myReader = new Scanner(myObj);

                   FileWriter myWriter = new FileWriter("C:/Users/Gabriel2/AppData/Roaming/JetBrains/IdeaIC2020.2/scratches/output.txt");

                   while (myReader.hasNextLine()) {

                       String data = myReader.nextLine();

                       int sum = 0;

                       for (int x = 0; x < 5; x++ ) {

                           sum += data.charAt(x);

                       }

                       int remainder = (sum % 10);

                       System.out.println(remainder);

                       System.out.println(data.charAt(5));

                       if (remainder == Integer.parseInt(String.valueOf(data.charAt(5)))) {

                           System.out.println("entered");

                           try {

                               myWriter.write(data + "\n");

                               System.out.println("Successfully wrote to the file.");

                           } catch (IOException e) {

                               System.out.println("An error occurred.");

                               e.printStackTrace();

                           }

                       }

                       sum = 0;

                   }

                   myWriter.close();

                   myReader.close();

               } catch (FileNotFoundException e) {

                   System.out.println("An error occurred.");

                   e.printStackTrace();

               } catch (IOException e) {

                   e.printStackTrace();

               }

           }

       }

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