Sunday, February 24, 2019

Java Example to check if entered Number is Prime or not

This Java Example if for beginners to check if entered number is prime i.e. number which is divisible by only two numbers first 1 and second itself. If any number is divisible by 3 or more numbers, it is not a prime number.

import java.util.Scanner;
public class Prime {

    public static void main(String[] args) {
        
        
        Scanner keyboard = new Scanner(System.in);

        int number = keyboard.nextInt();
        boolean flag = false;
        for(int i = 2; i <= number/2; ++i)
        {
            // condition for nonprime number
            if(number % i == 0)
            {
                flag = true;
                break;
            }
        }

        if (!flag)
            System.out.println(number + " is a prime number.");
        else
            System.out.println(number + " is not a prime number.");
    }
}

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