Simple Java program to find Prime number

This program has made simple for better understanding of beginners.

import java.util.Scanner;

public class PrimeNumber {

public static void main(String args[]){

System.out.println("Enter the number: ");

//To receive input from users

Scanner s = new Scanner(System.in);

int num = s.nextInt();

s.close();

//Logic to detect the prime number

for(int i=2; i<num; i++){

int temp = num%i;

if (temp == 0){

System.out.println("This is not a prime number.");

break;

} 

else{

if (i == (num-1)){

System.out.println("This is a prime number.");

}

}

} 

}

}

Output:

Enter the number: 

21

This is not a prime number.

Enter the number: 

3

This is a prime number.

Simple Java program for Odd or Even

This program has been simplified for beginners to find the given number is Odd or Even.

import java.util.Scanner;

public class OddrEven {

public static void main(String args[]){

//To get the input number from user

System.out.println("Enter the number: ");

Scanner sc = new Scanner(System.in);

int inp = sc.nextInt();

sc.close();

//Simple logic to check the number is Odd or Even

int temp = inp % 2;

if (temp == 0){

System.out.println("This is a even number.");

}else{

System.out.println("This is a odd number.");

}

}

}

Output:

Enter the number: 

45

This is a odd number.

Enter the number: 

22

This is a even number.