Question

Write a Java Program to find the sum of all factors of a given positive integer. Make sure to satisfy and show different results for any inputs, for example, 0, negative numbers, odd numbers, prime numbers, huge integers, etc.

For example, if the integer is 12: Then the factors are: 1, 2, 3, 4, 6, 12 ; And their sum is: 28.

Answer 1

//SumOfFactors.java
import java.util.Scanner;
public class SumOfFactors {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n;
        System.out.print("Enter an integer: ");
        n = scan.nextInt();
        if(n<=0){
            System.out.println("No factors");
        }
        else{
            System.out.print("Factors are: ");
            int sum = 0;
            for(int i = 1;i<=n;i++){
                if(n%i==0) {
                    System.out.print(i+" ");
                    sum += i;
                }
            }
            System.out.println("\nThe sum: "+sum);
        }
    }
}