Question

An integer number is said to be a perfect number if it is equal to the sum of its factors (divisors), including 1 (but not the number itself). For example, 6 is a perfect number because 6 = 3+2+1. Write a method called isPerfect that returns true if the input integer number is a perfect number and false otherwise. Then, call this method in the main method that determines and prints all the perfect numbers between 2 and 2000. WRITE A JAVA PROGRAM.

Answer 1

//PerfectNumbersInRange.java
public class PerfectNumbersInRange {
    public static boolean isPerfect(int num){
        int sum = 0;
        for(int i = 1;i<num;i++){
            if(num%i == 0){
                sum += i;
            }
        }
        return sum==num;
    }

    public static void main(String[] args) {
        for(int i  =2;i<=2000;i++){
            if(isPerfect(i)){
                System.out.println(i);
            }
        }
    }
}