# Hackerrank “30 Days of Code” Çözümleri – Day 19: Interfaces

Hackerrank’in 30 Days of Code içerisinde bulunan “Day 19: Interfaces” sorusunun açıklaması ve çözümü. Bu soruda interface kavramına kısaca göz attık.

► Hackerrank 30 Days of Code Çözümleri – Day 19: Interfaces: https://www.hackerrank.com/challenges/30-interfaces/problem

► Problem açıklaması:

Objective

Today, we’re learning about Interfaces. Check out the Tutorial tab for learning materials and an instructional video!

The AdvancedArithmetic interface and the method declaration for the abstract divisorSum(n) method are provided for you in the editor below.

Complete the implementation of Calculator class, which implements the AdvancedArithmetic interface. The implementation for the divisorSum(n) method must return the sum of all divisors of n.

Example

n = 25

The divisors of 25 are 1, 5, 25. Their sum is 31.

n = 20

The divisors of 20 are 1, 2, 4, 5, 10, 20 and their sum is 42.

Input Format

A single line with an integer, n.

Output Format

You are not responsible for printing anything to stdout. The locked template code in the editor below will call your code and print the necessary output.

Sample Input

6

Sample Output