In the previous article, we have discussed Java Program to Check Magic Number

In this article we are going to understand what Pronic number is and how we can check whether a number is Pronic or not in Java with examples.

## Program to Check Pronic Number

**Pronic numbers** are numbers that are product of two consecutive integers.

Example: 42: 6*7 Pronic Number 30: 5*6 Pronic Number 120: 10*12 Not Pronic Number

In the above examples the numbers 42 and 30 are Pronic numbers as their they are products of to consecutive integers. 120 is not a Pronic number.

Let’s see different ways to check pronic number.

The best and excellent way to learn a java programming language is by practicing Simple Java Program Examples as it includes basic to advanced levels of concepts.

**Approach :**

- We ask the user to enter a number which we store in a integer variable.
- We then use a for loop to iterate through all the numbers from 1 to num.
- All the consecutive integers in that range is multiplied and checked. If a product is found to be equal to the entered number, then flag is set to true.
- If
`flag==true`

it is a Pronic number else not.

### Method-1: Java Program to Check Pronic Number By Using Static Value

import java.util.Scanner; public class PronicNumber{ public static void main(String args[]) { //A number declared int num = 56; boolean flag = false; //Iteates from all numbers from 1 to num for(int iter=0; iter < num; iter++) { //Checks whether any consecutive number multiplies to num if(iter*(iter+1) == num) { flag =true; break; } } if(flag) { System.out.println(num+" is a Pronic Number"); } else { System.out.println(num+" is Not a Pronic Number"); } } }

Output: 56 is a Pronic Number

### Method-2: Java Program to Check Pronic Number By User Input Value

import java.util.Scanner; public class PronicNumber{ public static void main(String args[]) { //Taking the number as input from the user using scanner class Scanner scan = new Scanner(System.in); System.out.println("Enter a number : "); int num = scan.nextInt(); boolean flag = false; //Iteates from all numbers from 1 to num for(int iter=0; iter < num; iter++) { //Checks whether any consecutive number multiplies to num if(iter*(iter+1) == num) { flag =true; break; } } if(flag) { System.out.println(num+" is a Pronic Number"); } else { System.out.println(num+" is Not a Pronic Number"); } } }

Output: Case-1 Enter a number : 56 56 is a Pronic Number Case-2 Enter a number : 55 55 is a Pronic Number

### Method-3: Java Program to Check Pronic Number By Using User Defined Method

import java.util.Scanner; public class PronicNumber{ public static void main(String args[]) { //Taking the number as input from the user using scanner class Scanner scan = new Scanner(System.in); System.out.println("Enter a number : "); int num = scan.nextInt(); //calling the user defined method //to check Pronic number or not. checkNumber(num); } //checkNumber() method to check pronic number public static void checkNumber(int num) { boolean flag = false; //Iteates from all numbers from 1 to num for(int iter=0; iter < num; iter++) { //Checks whether any consecutive number multiplies to num if(iter*(iter+1) == num) { flag =true; break; } } if(flag) { System.out.println(num+" is a Pronic Number"); } else { System.out.println(num+" is Not a Pronic Number"); } } }

Output: Enter a number : 56 56 is a Pronic Number

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