Question

Homework Assignment on Mimir:

Read in a file "numbers.txt" into a Java program.

Sum up all the even numbers over 50.

Print the result to the console using System.out.println();

The file will only have numbers.

Code:

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;

/**
*
* @author David
*/
public class ReadingFiles {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws FileNotFoundException {
        // TODO code application logic here
  
}
        System.out.println(totalEven);
  

    }

}

Answer 1

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

public class ReadingFiles {

    public static void main(String[] args) throws IOException {
        int totalEven = 0, count = 0, n;
        File file = new File("numbers.txt");
        try {
            // open the file
            Scanner scan = new Scanner(file);
            // if file has contents to read
            // loop to read the contents of the file
            while(scan.hasNext() && count<50) {
                n = Integer.parseInt(scan.next());
                if(n % 2 == 0)
                    totalEven += n;
                count++;
            }
            scan.close();
            // close the Scanner object
        } catch (FileNotFoundException e) {
            // catch the exception if file not present
            System.out.println("File " + file.getName() + " not present ");
            System.exit(0);
        }
        System.out.println(totalEven);

    }
}