Random Tebak Angka

import java.util.Random;
import java.util.Scanner;
import java.lang.Math;
public class Main
{
    // instance variables - replace the example below with your own
    private int x;

    /**
     * Constructor for objects of class Main
     */
    public static void main(String[] args)
    {
        System.out.println("Random Number Guessing Game");
        Scanner sc = new Scanner(System.in);
        Random rand = new Random();
        System.out.print("Insert minimum number range: ");
        int minVal = sc.nextInt();
        System.out.print("Insert maximum number range: ");
        int maxVal = sc.nextInt();
        int range = maxVal - minVal + 1;
        int guessNum = minVal + rand.nextInt(range);
        int input;

        for(int i = 1; true; i++) {
            System.out.println("Guess the number! ");
            input = sc.nextInt();
            if (guessNum == input) {
                onSuccessful(i, range);
                break;
            } else if (input < guessNum){
                System.out.println("Wrong, number is larger than " + input);
            } else if (input > guessNum){
                System.out.println("Wrong, number is smaller than " + input);
            }
        }
    }

    private static void onSuccessful(int attempts, int range) {
        System.out.println("Correct! You got the number after " + attempts + " tries");
        int optimalAttempts = (int) Math.ceil(Math.log(range + 1)/Math.log(2));
        if (attempts <= optimalAttempts) {
            System.out.println("Congratulations! You guessed the number with " +
            "the optimal number of tries!");
        } else {
            System.out.println("Altough you correctly guessed the number, you " +
            "could've gotten it in "+ optimalAttempts + " tries");
        }
    }
}