HackerRank Java- Interface
You are given an interface AdvancedArithmetic which contains a method signature int divisor_sum(int n). You need to write a class called MyCalculator which implements the interface.
divisorSum function just takes an integer as input and return the sum of all its divisors. For example divisors of 6 are 1, 2, 3 and 6, so divisor_sum should return 12. The value of n will be at most 1000.
Read the partially completed code in the editor and complete it. You just need to write the MyCalculator class only. Your class shouldn't be public.
- import java.util.*;
- interface AdvancedArithmetic{
- int divisor_sum(int n);
- }
-
- class MyCalculator implements AdvancedArithmetic {
- public int divisor_sum(int n) {
- int sum = 0;
- int sqrt = (int) Math.sqrt(n);
- for (int i = 1; i <= sqrt; i++) {
- if (n % i == 0) {
- sum += i + n / i;
- }
- }
-
- if (sqrt * sqrt == n) {
- sum -= sqrt;
- }
- return sum;
- }
- }
-
-
- class Solution{
- public static void main(String []args){
- MyCalculator my_calculator = new MyCalculator();
- System.out.print("I implemented: ");
- ImplementedInterfaceNames(my_calculator);
- Scanner sc = new Scanner(System.in);
- int n = sc.nextInt();
- System.out.print(my_calculator.divisor_sum(n) + "\n");
- sc.close();
- }
- /*
- * ImplementedInterfaceNames method takes an object and prints the name of the interfaces it implemented
- */
- static void ImplementedInterfaceNames(Object o){
- Class[] theInterfaces = o.getClass().getInterfaces();
- for (int i = 0; i < theInterfaces.length; i++){
- String interfaceName = theInterfaces[i].getName();
- System.out.println(interfaceName);
- }
- }
- }
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