Lecture Notes on 12 Jun 2015

import java.util.*;

public class Test
{
  // computes the sum of the proper divisors of n
  public static int sumDivisors (int n)
  {
    int sum = 0;
    int divisor = 1;
    int limit = n / 2;
    while (divisor <= limit)
    {
      if (n % divisor == 0)
      {
        sum = sum + divisor;
      }
      divisor = divisor + 1;
    }
    return sum;
  }


  public static void main (String[] args)
  {
    // create a Scanner object
    Scanner sc = new Scanner (System.in);

    // prompt the user to enter a number
    System.out.print ("Enter a number: ");

    // read the user's input
    int n = sc.nextInt();

    // print the sum of the proper divisors
    System.out.println (sumDivisors (n));
  }

}