Java Program to check Number is Perfect or Not ?

Previously we Have Discussed the Program for

Java Program to find First And Second Maximum Number From int type Array ?

Here we learn the logic to test weather the given number or int is perfect or not.

A perfect number is a positive integer that is equal to the sum of its positive divisors, that is, the sum of its positive divisors excluding the number itself.

For Example The first perfect number is 6, because 1, 2, and 3 are its positive divisors, and sum of  1 + 2 + 3 = 6. Other Perfect Numbers are 28 ,496 and so on.

public class PerfectNumber {

 public static boolean isNumPerfect(int num){

 boolean status = false;

 int temp = 0;

 for(int i=1;i<=num/2;i++){

  if(num%i == 0){

   temp+= i;

  }

 }

 if(temp == num){

  status = true;

 } else{

  status = false;

 }

 return status;

}

public static void main(String[] args) {

 System.out.println("Is 6 Perfect Number : "+PerfectNumber.isNumPerfect(6));

 System.out.println("Is 28 Perfect Number : "+PerfectNumber.isNumPerfect(28));

 System.out.println("Is 30 Perfect Number : "+PerfectNumber.isNumPerfect(30));

}

}

Program Output:

Is 6 Perfect Number : true

Is 28 Perfect Number : true

Is 30 Perfect Number : false

      

Blog Author - Pushkar Khosla,
Software Developer by Profession with 3.0 Yrs of Experience , through this blog i'am sharing my industrial Java Knowledge to entire world. For any question or query any one can comment below or mail me at pushkar.itsitm52@gmail.com.

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