Hangman

[ZainAsad]

I am having trouble with a hangman program. Every time I try to compile, it tells me that variables haven't been declared in functions. Below is the code; I need help with the "evaluate" function specifically. That's where the variables are showing as undeclared. How do you use values from main() in other functions?

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <ctime>
#include <cctype>

using namespace std;
const int MAX_WRONG = 8;
char getText(void);
void evaluate(char, string, string, const string, int);
int main()
{
    vector<string> words;
    words.push_back("GUESS");
    words.push_back("HANGMAN");
    words.push_back("DIFFICULT");

    srand(time(0));
    random_shuffle(words.begin(), words.end());
    const string THE_WORD = words[0];
    int wrong = 0;
    string soFar(THE_WORD.size(), '-');
    string used = "";
    cout << "Welcome to Hangman. Good luck!\n";
    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;
        char guess = getText();
        evaluate(guess, soFar, used, THE_WORD, wrong);
    }
    if (wrong ==  MAX_WRONG)
        cout << "\nYou've been hanged!";
    else
        cout << "\nYou guessed it!";
        cout << "\nThe word was " << THE_WORD << endl;


    return 0;
}

char getText()
{
    char text;
    cout << "Enter your guess: ";
    cin >> text;
    text = toupper(text);
    return text;
}
void evaluate(char, string, string, const string, int)
{
    while (used.find(guess) != string::npos)
    {
        cout << "\nYou've already guessed " << guess << endl;
        guess = getText();
    }
    used  += guess;

    if (THE_WORD.find(guess) != string::npos)
    {
        cout << "That's right, " << guess << " is in the word.\n";
        for (int = 0; i < THE_WORD.length(); ++i)
            if (THE_WORD[i] == guess)
                soFar[i] = guess;
    }
    else
    {
        cout << "Sorry, " <<guess << " isn't in the word.\n";
        ++ wrong;
    }
}

Also, I'm starting to think c++ is beyond my mental capacity. Any suggestions on easier languages?