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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


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