package specialNumbers;

/*

* @author Anish

*

*/

public class PerfectNumber {

/* Perfect Number is is a positive integer that is equal to the sum of its positive divisors,

excluding the number itself.

For Example, 6 has divisors 1, 2 and 3, and 1 + 2 + 3 = 6,

so 6 is a perfect number.

*/

public static void perfectNumber(int num) { //Static MEthod

int sum=0;

for(int i=1;i<num;i++) { // Loops till i is smaller than num

if(num%i==0) // checks if i is a factor of num

sum = sum + i; // if i is factor add to sum

}

if (sum == num) // check whether sum is same as num itself

System.out.println(">> "+ num +" is a Perfect number"); // IF YES prints Perfect NUmber

else

System.out.println(">> "+ num +" is NOT a Perfect number"); // IF NOT prints not perfect Number

}

// MAIN METHOD

public static void main(String[] args) {

// Input is another public class having getNumber STATIC Method and a return type of INTEGER

System.out.println(" Find a Number is Perfect or Not");

int num = Input.getNumber(); // gets NUM

perfectNumber(num); // Static Method to check a Number is perfect or not

}

}