Write a java program that reads an integer N (2 <= N <= 10000) from an input fil

Question

Write a java program that reads an integer N (2 <= N <= 10000) from an input file named “input7.txt” and then outputs
a. All numbers that are divisible by 3 to the output file named “output7A.txt”
b. All primes from 2 to N to the output file named “output7B.txt”
Requirements:
+ For each part a) and b), define a method called readDataFromFile() that takes into account the input filename as the parameter and returns the number N.
+ In part a), write a function called printNumbersToFile() that takes the output filename as the parameter and prints out all numbers which are divisible by 3 (0 excluded).
+ In part b), write a function called printPrimesToFile() that takes the output filename as the parameter and prints out all primes.
Example: Input File “input7.txt” 10 Output File “output7A.txt” 369 File “output7B.txt” 2357

Write a java program that reads an integer N (2 <= N <= 10000) from an input file named “input7.txt” and then outputs
a. All numbers that are divisible by 3 to the output file named “output7A.txt”
b. All primes from 2 to N to the output file named “output7B.txt”
Requirements:
+ For each part a) and b), define a method called readDataFromFile() that takes into account the input filename as the parameter and returns the number N.
+ In part a), write a function called printNumbersToFile() that takes the output filename as the parameter and prints out all numbers which are divisible by 3 (0 excluded).
+ In part b), write a function called printPrimesToFile() that takes the output filename as the parameter and prints out all primes.
Example: Input File “input7.txt” 10 Output File “output7A.txt” 369 File “output7B.txt” 2357

Write a java program that reads an integer N (2 <= N <= 10000) from an input file named “input7.txt” and then outputs
a. All numbers that are divisible by 3 to the output file named “output7A.txt”
b. All primes from 2 to N to the output file named “output7B.txt”
Requirements:
+ For each part a) and b), define a method called readDataFromFile() that takes into account the input filename as the parameter and returns the number N.
+ In part a), write a function called printNumbersToFile() that takes the output filename as the parameter and prints out all numbers which are divisible by 3 (0 excluded).
+ In part b), write a function called printPrimesToFile() that takes the output filename as the parameter and prints out all primes.
Example: Input File “input7.txt” 10 Output File “output7A.txt” 369 File “output7B.txt” 2357 Input File “input7.txt” 10 Output File “output7A.txt” 369 File “output7B.txt” 2357

Explanation / Answer

Below is the solution:

package chegg;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

public class PrimeNumberFromFile {
   public static void main(String[] args) throws FileNotFoundException,IOException, IndexOutOfBoundsException {
       String fileName = "D:/input7A.txt"; //file that has to read
        Scanner inputFile = new Scanner(System.in); //for file input
        inputFile = new Scanner(new File(fileName)); //take a file
        int counter =0; //for count the array element
      
        //keep track of how many integers in the file
        while(inputFile.hasNextInt())
        {
            counter++; //count the array element
            inputFile.nextInt();
        }
        Scanner scan2 = new Scanner(new File(fileName));
        int a[] = new int[counter]; //create a array with counter
        int b[]; //create a array with counter
        for(int i=0;i<counter;i++)
        {
            a[i]=scan2.nextInt(); //fill the array with the integers
            //System.out.println(a[i]);
        }
      
        PrintWriter writer1 = new PrintWriter("D:/output7A.txt", "UTF-8"); //create a file
        for(int j=0;j<counter;j++){
           if(a[j]>=2 && a[j]<=1000)
           {
               if(a[j]%3==0){
                   writer1.println(a[j]); //write into file
               }
           }
        }
        writer1.close(); //close the file output7A file
      
        int count=0;
        PrintWriter writer2 = new PrintWriter("D:/output7B.txt", "UTF-8"); //create a file
        for(int k=0; k<=counter; k++)
        {
           if(a[k]>=2 && a[k]<=1000){
               count = 0;
                for(int j=2; j<a[k]; j++)
                {
                    if(a[k]%j == 0)
                    {
                        count++;                     
                        break;
                    }
                }
                if(count == 0)
                {
                   writer2.println(a[k]);//write into file
                   System.out.println(a[k]); //print the prime number                  
                }
           }
        }
        writer2.close();
   }
}

sample input file:

input7a.txt

12
60
58
47
3
9
13
25

sample output::

output7A.txt:

12
60
3
9

output7B.txt:

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