BlueJ Program on Perfect Number Checking Of A Number Or Its Nearest Number

In this program user will enter a number and the program will show whether it is a perfect number. If the entered number is not a perfect number then the nearest higher value of the entered number which is a perfect number will be displayed.

BlueJ Codes of the Perfect Number Checking Program

 import java.io.*;

class border

{

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

 int i,s,n,j;

 public void take()throws IOException

 {

     System.out.println("Enter the number:");

     n=Integer.parseInt(br.readLine());

     j=n;

     s=0;

     for(i=1;i< n;i++)

     {

          if(n%i==0)

          s=s+i;

        }

        if(s==n)

        System.out.println("Number = "+ n + " is a perfect number");

        else

        {

             s=0;

             n++;

             while(true)

             {

                 for(i=1;i< n;i++)

                 {

                      if(n%i==0)

                      s=s+i;

                    }

                    if(s==n)

                    {

                    System.out.println(n+ " is perfect number nearest to "+j);

                    break;

                }

                else

                {

                     s=0;

                     n++;

                    }

                }

            }

        }

           

public static void main(String args[])throws IOException

{

border ob=new border();

ob.take();

}

}

Technical Analysis of the perfect number program using BlueJ

If the entered number is a perfect number then the matter is solved otherwise an infinite while loop is executed and the entered number is incremented by one every time the new number is found not perfect number. When the incremented number is found to be perfect number, the result is displayed and the infinite loop is terminated.

Related Post: BlueJ Java Programs on Numbers For ICSE and ISC Students

Sample Input and Output of the perfect number program

Enter the number:

7

28 is perfect number nearest to 7

Enter the number:

28

Number = 28 is a perfect number

Enter the number:

5

6 is perfect number nearest to 5

Related posts:

Program on possible consecutive numbers

Program on Perfect Number

Program on Automorphic Number

Program on Saddle Number

Program on Armstrong Number