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  1. Prepare
  2. Tutorials
  3. 30 Days of Code
  4. Day 19: Interfaces
  5. Discussions

Day 19: Interfaces

  • edgalvazquez
     + 0 comments

    In C#

    I tried dividing as I go throug the loop. If the division results didn't have any decimals, then I added both numbers to the set. This way I only go through half the numbers.

    public class Calculator : AdvancedArithmetic
{
    HashSet<int> divisors = new HashSet<int>();
    public int divisorSum(int n)
    {
        int half = (int)Math.Ceiling(n / 2.0);
        for(int i = 1; i <= half; i++){
            double div = n / (double)i;
            if(div % 1 == 0)
            {
                divisors.Add(i);
                divisors.Add((int)div);
            }          
        }
        return divisors.Sum();
    }
}