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PP4082.java
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executable file
·170 lines (145 loc) · 5.62 KB
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//********************************************************************
// PP4082.java picks a random number between 1 and max (inclusive),
// then repeatedly prompts the user to guess the number
//********************************************************************
import java.util.Scanner;
import java.util.Random;
public class PP4082
{
final static int max = 100;
//********************************************************************
// Plays the guessing game.
//********************************************************************
static public void main (String[] args)
{
int gameCount = 0;
int[] scores = new int[10000];
do
{
scores[gameCount] = playGame();
gameCount++;
}
while(playAgain());
displayResults(gameCount, scores);
}
//********************************************************************
// Displays results of all games at completion.
//********************************************************************
static void displayResults(int gameCount, int[] scores)
{
int sum = 0, invalidGames = 0;
for(int i = 0; i < gameCount; i++)
{
if (scores[i] == 0)
invalidGames ++;
else
sum += scores[i];
}
double average = (double)sum / (gameCount - invalidGames);
System.out.println("Your completed " + (gameCount - invalidGames) + " games for an avergae of " + average + " guesses per game.");
if(invalidGames > 0)
System.out.println("You had " + invalidGames + " of " + gameCount + " incomplete games which did not affect your average.");
}
//*********************************************************************************
// Plays one instance of the guessing game until user quits or number is guessed.
// Returns number of guesses, or 0 if user quits.
//*********************************************************************************
static int playGame()
{
int guess, closestGuess = max, guessCount = 0, rand = generateRandomNumber(max), previousGuess = 0;
boolean guessAttempt = false, warmer = false, same = false;
System.out.println("Guess the random number between 1 and " + max + ". 0 to quit. v2");
do
{
System.out.print("Guess: ");
guess = getIntGuess();
if (guess == 0)
{
System.out.println("You quit after " + guessCount + " valid guesses.");
System.out.println("The answer was: " + rand);
System.out.println(guessAttempt ? "Your closest guess was: " + closestGuess + "\n": "");
}
else
{
guessCount++;
if (guessAttempt) {
if (Math.abs(rand - guess) == Math.abs(rand - previousGuess))
same = true;
if (Math.abs(rand - guess) < Math.abs(rand - previousGuess))
warmer = true;
else
warmer = false;
}
if (Math.abs(rand - guess) < Math.abs(rand - closestGuess))
closestGuess = guess;
if (guess == rand)
System.out.println("Correct. You took " + guessCount + " guesses.\n");
else
System.out.print(guessAttempt ? guess + " is " + ( same ? "neither warmer or colder " : ( warmer ? "warmer " : "colder ") ) + "than " + previousGuess + ". " : "" );
if (guess < rand)
System.out.println("Guess is low.");
else if (guess > rand)
System.out.println("Guess is high.");
previousGuess = guess;
if(!guessAttempt)
{
guessAttempt = true;
closestGuess = guess;
}
}
}
while (guess != 0 && rand != guess);
return (guess==0) ? 0 : guessCount;
}
//********************************************************************
// Returns a valid guess from user.
//********************************************************************
static int getIntGuess()
{
int guess;
Scanner scan = new Scanner(System.in);
do
{
while (!scan.hasNextInt())
{
scan.next();
System.out.println("Guess must be a valid integer.");
System.out.print("Guess: ");
}
guess = scan.nextInt();
if (isGuessOutOfRange(guess))
{
System.out.println("Guess must be between 1 and " + max + ".");
System.out.print("Guess: ");
}
}
while (isGuessOutOfRange(guess));
return guess;
}
//********************************************************************
// Checks if users guess is within valid range.
//********************************************************************
static boolean isGuessOutOfRange(int guess)
{
return (guess < 0 || guess> max);
}
//********************************************************************
// Asks the user if they want to play again.
//********************************************************************
static boolean playAgain()
{
Scanner scan = new Scanner(System.in);
System.out.print("Play again (y/n)?");
String play = scan.next();
return (play.toLowerCase().charAt(0) == 'y');
}
//********************************************************************
// Generates and returns a random number for user to guess.
//********************************************************************
static int generateRandomNumber(int max)
{
Random generator = new Random();
int rand = generator.nextInt(max) + 1;
return rand;
}
}