【C++ Primer Plus习题】16.3

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问题:

解答:

#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <fstream>
#include <vector>

using namespace std;

const int NUM = 26;

//const string wordlist[NUM] = { "apiary","beetle","cereal","danger","ensign","florid",
//                            "garage","health","insult","jackal","keeper","loaner",
//                            "manage","nonce","onset","plaid","quilt","remote","stolid"
//                            "train","useful","valid","whence","xenon","yearn","zippy" };

int main()
{
    ifstream fin;
    fin.open("word.txt", ifstream::in);
    if (!fin.is_open())
    {
        cerr << "Can't open file word.txt." << endl;
        exit(EXIT_FAILURE);
    }

    string word;
    vector<string>wordlist;
    if (fin.good())
    {
        while (fin >> word)
        {
            wordlist.push_back(word);
        }
    }
    int length = wordlist.size();
    fin.close();

    srand(time(0));
    char play;
    cout << "Will you play a word game? <y/n> ";
    cin >> play;
    play = tolower(play);
    while (play=='y')
    {
        string target = wordlist[rand() % NUM];
        int length = target.length();
        string attempt(length, '-');
        string badchars;
        int guesses = 6;
        cout << "Guess my secret word.It has " << length << " letters,and you guess\n" << "one letter at a time.You get " << guesses << " wrong guesses.\n";
        cout << "Your word: " << attempt << endl;
        while (guesses>0&&attempt!=target)
        {
            char letter;
            cout << "Guess a latter: ";
            cin >> letter;
            if (badchars.find(letter) != string::npos || attempt.find(letter) != string::npos)
            {
                cout << "You already guessed char.Try again.\n";
                continue;
            }
            int loc = target.find(letter);
            if (loc == string::npos)
            {
                cout << "Oh, bad guess!\n";
                --guesses;
                badchars += letter;
            }
            else
            {
                cout << "Good guess!\n";
                attempt[loc] = letter;
                loc = target.find(letter, loc + 1);
                while (loc!=string::npos)
                {
                    attempt[loc] = letter;
                    loc = target.find(letter, loc + 1);
                }
            }
            cout << "Your word: " << attempt << endl;
            if (attempt != target)
            {
                if (badchars.length() > 0)
                {
                    cout << "Bad choices: " << badchars << endl;
                    cout << guesses << " bad guess left\n";
                }
            }
        }
        if (guesses > 0)
        {
            cout << "That's right!\n";
        }
        else
        {
            cout << "Sorry, the word is " << target << ".\n";
        }
        cout << "Will you play another?<y/n>";
        cin >> play;
        play = tolower(play);
    }
    cout << "Bye\n";
    return 0;
}