Write a program to check perfect number or not?
A perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself. Equivalently, a perfect number is a number that is half the sum of all of its positive divisors. The first perfect number is 6, because 1, 2 and 3 are its proper positive divisors, and 1 + 2 + 3 = 6. Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6.
package com.tech.mindclues; import java.util.Scanner; public class PerfectNumberOrNot { public static void main(String args[]) { System.out.println("Enter the number to check its perfect or not :"); Scanner sc = new Scanner(System.in); int number = sc.nextInt(); int temp_number = 0; for (int i = 1; i <= number / 2; i++) { if (number % i == 0) { temp_number += i; } } if (number == temp_number) { System.out.println("Number is Perfect."); } else { System.out.println("Not a Perfect Number."); } } }
Enter the number to check its perfect or not : 6 Number is Perfect.
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