猜单词游戏（c++）

#include<iostream>
#include<string>
#include<fstream>
#include<cstdlib>
#include<ctime>
#include<cctype>
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()
{
    srand(time(0));
    char play;
    cout<<"Will you play a ward 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 time you get "
        <<guesses<<" wrong guesses.\n";
        cout<<"Your word: "<<attempt<<endl;
        while(guesses>0&&attempt!=target)
        {
            char letter;
            cout<<"Guess a letter: ";
            cin>>letter;
            if(badchars.find(letter)!=string::npos||
               attempt.find(letter)!=string::npos)
            {
                cout<<"You already guessed that. 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 guesses 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<<"Bey!\n";
    return 0;
}