数当てゲーム

import java.util.*;

// geschrieben von Beliar698ma

class NumGuess {
  public static void main(String[] args) {

    int guessCount = 1;
    int userGuess = 0;
    String guessHistory = "予想履歴: ";
    int randomNum = (int)Math.floor(Math.random() * 100) + 1;

    Scanner sc = new Scanner(System.in);

    while(true) {

      if (guessCount == 11) {
        System.out.println("!!! GAME OVER !!!");
        break;
      }

      System.out.println("予想値を入力してください。");

      if (sc.hasNextInt()) {
        userGuess = sc.nextInt();
      } else {
        System.out.println("有効な値を入力してください。");
        sc.next();
        continue;
      }

      if (userGuess < 1 || 100 < userGuess) {
        System.out.println("1 ~ 100の値を入力してください。");
        continue;
      }

      if(userGuess == randomNum) {
        guessHistory += userGuess + ", ";
        System.out.println(guessHistory.substring(0, guessHistory.length() - 2));
        System.out.println("おめでとうございます！正解です！");
        break;
      } else if (userGuess < randomNum) {
        guessHistory += userGuess + ", ";
        System.out.println(guessHistory.substring(0, guessHistory.length() - 2));
        System.out.println("予想値は正解値より小さいです。");
      } else if (userGuess > randomNum) {
        guessHistory += userGuess + ", ";
        System.out.println(guessHistory.substring(0, guessHistory.length() - 2));
        System.out.println("予想値は正解値より大きいです。");
      }
      
      guessCount++;
    }
    sc.close();
  }
}        

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