Java (BlueJ) program to check for Pronic Number (Heteromecic Number)

Pronic Number :  A pronic number, oblong number, rectangular number or heteromecic number, is a number which is the product of two c...

Pronic Number : A pronic number, oblong number, rectangular number or heteromecic number, is a number which is the product of two consecutive integers, that is, n (n + 1).

The first few pronic numbers are:
0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 … etc.

Program Input:

import java.util.*;

class PronicNumber

{

    public static void main(String args[])

    {

        Scanner sc = new Scanner(System.in);

         

        System.out.print("Enter a number : ");

        int n = sc.nextInt();

        int flag = 0;

    

        for(int i=1; i<=n; i++)

        {

            if(i*(i+1) == n)

            {

                flag = 1;

                break;

            }

        }

         

        if(flag == 1)

            System.out.println(n+" is a Pronic Number.");

        else

            System.out.println(n+" is not a Pronic Number.");     

    }

}




Alternate Program :

import java.util.*;

class PronicNumber

{

    public static void main(String args[])

    {

        Scanner sc = new Scanner(System.in);

         

        System.out.print("Enter a number : ");

        int n = sc.nextInt();

        int k = (int)(Math.sqrt(n));

        if(k*(k+1)==n)

            System.out.println(n+" is a Pronic Number.");

        else

            System.out.println(n+" is not a Pronic Number.");     

    }

}




Output:

Enter a number : 110 110 is a Pronic Number.   Enter a number : 73 73 is not a Pronic Number.   Enter a number : 342 342 is a Pronic Number.   Enter a number : 15 15 is not a Pronic Number.