Câu 1 đề thi vietai

Cau1.java

import java.util.Scanner;

public class Cau1 {

	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);
		int input = scanner.nextInt();
		System.out.println(checkPerfectNumber(input	));
	}

	public static boolean checkPerfectNumber(int number) {
		//tim cac uoc

		int sum = 0;
		for (int i = 1; i < number; i++) {
			if (number % i == 0) {
				sum += i;
			}
		}

		return sum == number;
	}
}