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Ace the AP Computer Science Exam for High Schoolers

Solution Review

Explore how to create a number guessing game by generating a random secret number and using conditional statements to check users’ guesses. Understand how infinite and fixed iteration loops control gameplay. Learn to implement win checks, provide hints, and limit attempts, gaining hands-on Java coding experience within this project.

We'll cover the following...

Task I: Generate the secret number

The task was to generate a random number to be guessed by the player.

We can use the formula Math.random() * (max - min + 1) to generate a random value between 0 and 100 (inclusive). Our max value is 100 and our min is 0.

Java
//Generating a random integer between 0 and 100 inclusive
  int secret_number = (int) (Math.random() * (100 - 0 + 1));

Task II: Implement the game logic

The task was to check for a win, and if the player doesn’t meet the win condition, give them hints about how near or far their number is from the secret number.

Java
int secret_number = (int) (Math.random() * (100 - 0 + 1)); //from last part
int userGuessNumber = 0;
while(true){
    userGuessNumber = takeInput(userGuessNumber);
            
    if (userGuessNumber < secretNumber)
    {
      System.out.println("Your guessed number is smaller.");
    }
    else if (userGuessNumber > secretNumber)
    {
      System.out.println("Your guessed number is greater.");
    }
    else
    {
      System.out.println("Yay, you won!");
      return;
    }
}

  • Line 4: The while(true) ...