Chapter 15, Problem 10PP

Solution to Programming Project 15.10

Listed below is code to play a guessing game. In the game two players

attempt to guess a number. Your task is to extend the program with objects that represent either a human player or a computer player. The rand() function requires you include cstdlib (see Appendix 4):

bool checkForWin(int guess, int answer) { cout<< "You guessed" << guess << "."; if (answer == guess) { cout<< "You're right! You win!" <<endl; return true; } else if (answer < guess) cout<< "Your guess is too high." <<endl; else cout<< "Your guess is too low." <<endl; return false; } void play(Player &player1, Player &player2) { int answer = 0, guess = 0; answer = rand() % 100; bool win = false; while (!win) { cout<< "Player 1's turn to guess." <<endl; guess = player1.getGuess(); win = checkForWin(guess, answer); if (win) return; cout<< "Player 2's turn to guess." <<endl; guess = player2.getGuess(); win = checkForWin(guess, answer); } }

The play function takes as input two Player objects. Define the Player class with a virtual function named getGuess(). The implementation of Player::getGuess() can simply return 0. Next, define a class named HumanPlayer derived from Player. The implementation of HumanPlayer::getGuess() should prompt the user to enter a number and return the value entered from the keyboard. Next, define a class named ComputerPlayer derived from Player. The implementation of ComputerPlayer::getGuess() should randomly select a number between 0and 99 (see Appendix 4 for information on random number generation).Finally, construct a main function that invokes play(Player &player1, Player &player2) with two instances of a HumanPlayer (human versus human), an instance of a HumanPlayer and Computer Player (human versus computer),and two instances of ComputerPlayer (computer versus computer).