Listed here is a code to play a guessing game in which 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

0 and 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 ComputerPlayer (human

versus computer), and two instances of ComputerPlayer (computer versus

computer).