Declaring variable in do-while loop and outside as random numbers

Question

I have been trying to write code, which makes the machine guess a random number from 1 to 1000. Because I know how to write it in pascal and python, I tried to write it in java, but I'm stuck now.

Here is the code:

import java.util.concurrent.ThreadLocalRandom;

public class Test {

    public static void main(String[] args) {

        int random = ThreadLocalRandom.current().nextInt(0, 1000);
        int count = 0;

        do {
            int answer = ThreadLocalRandom.current().nextInt(0, 1000);
            count++;
        } while (random != answer);

        System.out.println("Answer: " + answer + " " + "Count: " + count);
    }
}

The problem is, that in this line

    } while (random != answer);

answer is not defined.

I am trying to do the loop, until random equals answer .

The question is, how do I define the answer variable as a random changing number, while the variable random stays the same?

Thanks in advance!

Answer 1

You have to define int answer outside of the do{}while(...) :

public static void main(String[] args) {

    int random = ThreadLocalRandom.current().nextInt(0, 1000);
    int count = 0;
    int answer;
    do {
        answer = ThreadLocalRandom.current().nextInt(0, 1000);
        count++;
    } while (random != answer);

    System.out.println("Answer: " + answer + " " + "Count: " + count);
}