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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