hangman.cpp rev2

/*
*  Classic game of hangman / 25th May 2008
*  Programming by krazekaveman <brandonkite92@gmail.com> and Ricky Hewitt [kahrn] <kahrny@gmail.com>
*  Free to use/edit/republish without restriction
*
*  Make sure you have generated a wordlist.
*  A wordlist is a list of words, seperated by a newline (e.g. word1\nword2\nword3\n).
*
*  22.03.2012:
*    - Updated to prevent SIGV exit when wordlist was not found,
*      display error instead. <ricky.hewitt@gmail.com>
*
*  25.05.2008:
*    - Initial release <brandonkite92@gmail.com> <ricky.hewitt@gmail.com>
*/

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
#include <ctime>
#include <cctype>
#include <cstdlib> // for exit()

using namespace std;

// The location of the wordlist
const char *WORDLIST_LOCATION = "wordlist.txt";

// Function declarations
void call_hangman();
vector<string> generate_wordlist();


int main()
{
    cout << "Welcome to Hangman! Good luck\n";

    call_hangman(); // This calls hangman, initialises the game and stuff.

    // While loop is to determine whether or not to play again.
    while (1) {
        // Prompt for playing again, act upon..
        char cPlayAgain = '!';
        cout << "\nPlay again? (Y/N): ";
        cin.getline(&cPlayAgain, 2);

        // Play the game again.
        if (cPlayAgain == 'y' or cPlayAgain == 'Y') {
            call_hangman();
            cout << endl; // Create new line (for fancy output)
        }

        // Exit
        if (cPlayAgain == 'n' or cPlayAgain == 'N') {
            break;
        }
    }

    return 0;
}


vector<string> generate_wordlist()
{
    // Initialise vector
    vector<string> words;

    // Read from file and retrieve word list
    ifstream wordfile;
    string line;

    wordfile.open(WORDLIST_LOCATION);
    if (wordfile.is_open()) {
        while (!wordfile.eof()) {
            getline(wordfile, line);
            // Discard empty lines and comment lines
            if (line != "" and line[0] != '#') {
                // Convert string to uppercase
                for (int i = 0; i < line.length(); i++) {
                    line[i] = toupper(line[i]);
                }

                // Add converted string to string vector.
                words.push_back(line);
            }
        }
        wordfile.close();
    }
    else {
        cout << "Could not open " << WORDLIST_LOCATION << endl;
        exit(0);
    }

    return words;
}


void call_hangman()
{
    // Setup
    const int MAX_WRONG = 8;
    int wrong=0;

    // Generate random word
    vector<string> words = generate_wordlist();

    srand(time(0));
    random_shuffle(words.begin(), words.end());

    string THE_WORD = words[0]; // The generated random word
    string soFar(THE_WORD.size(),'-'); // The guess so far by the user
    string used=""; // Characters that have been guessed.

    // Check if the player gets to keep guessing
    while ((wrong<MAX_WRONG) && (soFar!=THE_WORD))
    {
          cout << "\n\nYou Have " << (MAX_WRONG-wrong) << " incorrect guesses left.\n";
          cout << "\nYou've used the following letters:\n" << used << endl;
          cout << "\nSo far, the word is:\n" << soFar << endl;

          // Get the players guess
          char guess;
          cout << "\n\nEnter your guess: ";
          cin >> guess; // bug here

          guess = toupper(guess); // make uppercase
          while (used.find(guess) != string::npos)
          {
                cout << "\n You've already guessed: "<<guess<<".\n";
                cout << "\n\nEnter your guess: ";
                cin >> guess;
                guess = toupper(guess); // make uppercase
          }

          used += guess;

          // If the user guesses a correct character.
          if (THE_WORD.find(guess) != string::npos)
          {
             cout << "That's right! " << guess << " is in the word\n";

             //update soFar to include the newly guessed number
             for (unsigned int i=0; i<THE_WORD.length(); ++i)
             {
                 if (THE_WORD[i]==guess)
                 {
                  soFar[i]=guess;
                 }
             }
          }
          else
          {
              cout << "Sorry " << guess << " isn't in the word";
              ++wrong;
          }
    }

    // End of the game
    if (wrong == MAX_WRONG) {
        cout << "\nYou have been HANGED!\n";
        cout << "\b" << endl;
    }

    else {
        cout << "\nYou guessed it!\n";
    }

    cout << "The word was " << THE_WORD << endl;

    getchar();
}