Java Example Programs – Prime Number Program In Java

Hey, Today we will learn how to check the number is prime or not. First of all we need to know what is a prime number ? The simplest answer is the number can divide by 1 and the number itself then it’s a prime number , Example 1 and 7. here divide means no reminder value. so for 7 we can divide this number with 1 and 7 only . other number also can divide but there will be reminder value. So let’s check the program.

package practice.house.com;

import java.util.Scanner;

public class PrimeNumber {

	public static void main(String args[]) {
		int n, i, res;
		boolean flag = true;
		Scanner sc = new Scanner(System.in);
		System.out.println("Please Enter a No.");

		n = sc.nextInt();
		for (i = 2; i <= n / 2; i++) {
			res = n % i;
			if (res == 0) {
				flag = false;
				break;
			}
		}
		if (flag)
			System.out.println(n + " is Prime Number");
		else
			System.out.println(n + " is not Prime Number");

	}

}

package practice.house.com;

import java.util.Scanner;

public class PrimeNumber {

public static void main(String args[]) {

int n, i, res;

boolean flag = true;

Scanner sc = new Scanner(System.in);

System.out.println("Please Enter a No.");

n = sc.nextInt();

for (i = 2; i <= n / 2; i++) {

res = n % i;

if (res == 0) {

flag = false;

break;

}

if (flag)

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

else

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

}

OUTPUT:

Please Enter a No.
7
7 is Prime Number

------ ***** -----
Please Enter a No.
9
9 is not Prime Number

Please Enter a No.

7 is Prime Number

------ ***** -----

Please Enter a No.

9 is not Prime Number

here in the output you can see that 9 is not a prime number because 9 can divide by 3 with a reminder 0. So number 9 can divide by 1,3,9 So it’s not a prime number.

Thanks for reading this post. Stay tune with us to get more practices programs.

Happy Coding Happy Living…

Md Arifur Rahman

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