Prime number

/*
 * Prime number
 * Date : 26.05.19
 */
import java.util.Scanner;
public class Prime {
    public static void main(String args[]) {
        Scanner input = new Scanner(System.in);
        int a, b;
        System.out.print("Enter Lower limit: "); a = input.nextInt();
        System.out.print("Enter Upper limit: "); b = input.nextInt();

        System.out.println("The Prime numbers within range(" + a + " - " + b + ") : ");
        for(int i = a; i <= b; i++) {
            if(isPrime(i)) System.out.print(i +" ");
        }
        input.close();
    }

    static boolean isPrime(int a) {
        for(int i = 2; i <= Math.sqrt(a); i++) {
            if((a % i) == 0) return false;
        }
        return true;
    }
}