Java program to check for Pronic Number (Heteromecic Number)

14 August 2015

Java program to input a number and check whether it is a pronic number (heteromecic number) or not.

Question:

Write a Program in Java to input a number and check whether it is a Pronic Number or Heteromecic Number or not.

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.

Programming Code:

Java

/**
* The class HarshadNumber inputs a number and checks if it a Pronic Number or not
* @author : www.guideforschool.com
* @Program Type : BlueJ Program - Java
*/

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 Programming Code:

Java

/**
* The class HarshadNumber inputs a number and checks if it a Pronic Number or not
* @author : www.guideforschool.com
* @Program Type : BlueJ Program - Java
*/

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:

Plain

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.