Perfect Number Logic in Java

Perfect Number Logic In Java

class PerfectNumber 

{

public static void main(String[] args) 

{

int sum=0, num=28, i;

         for(i=1;i<num;i++)

         {

                 if(num%i==0)

                          sum=sum+i;

         }

         if(sum==num)

{

System.out.println(""+num+" is a PERFECT NUMBER");

}

         else

{

System.out.println(""+num+" is a not a PERFECT NUMBER");

}

}

}

Perfect Number is a number whose factors add up for the number itself.

suppose number is x and its factors are a,b,c.

Then x will be considered as Perfect number if.

a+b+c=x

factors of 28 are 1,2,4,7,14.

&

1+2+4+7+14 =28

Hence 28 is a Perfect Number