задача първа от второ домашно - 4 in a row

#include <iostream>

const int MAXLEN = 40;
const int MAXHEIGHT = 20;
const char _DEFCHAR = ' ';

void printBoard(char matrix[][MAXLEN], int length, int height) {
    std::cout << "Board:\n";
    for (int i = 0; i < height; i++) {
        for (int g = 0; g < length; g++) {
            std::cout << "|" << matrix[i][g];
        }
        std::cout << "|" << std::endl;
    }
}

void initGameboard(char matrix[][MAXLEN], int length, int height) {
    for (int i = 0; i < height; i++) {
        for (int g = 0; g < length; g++) {
            matrix[i][g] = _DEFCHAR;
        }
    }
}

void makeMove(char matrix[][MAXLEN], int length, int height, bool xTurn) {
    int table = 0;
    bool iRight = false;
    int iterate = height;

    do {
        if (iRight)
            std::cout << "Wrong move... Are you blind?" << std::endl;

        std::cout << "Enter your move: ";
        std::cin >> table;
        bool validation = !((bool)(std::cin));
        if (validation) {
            system("title = I've spent an solid hour trying to restrict symbol input.. Just because of people like you. No symbols allowed!!!");
            std::cin.clear();
            std::cin.ignore(255, '\n');
        }
        else
            system("title = Four in a row!");

        iRight = true;
    } while (table > length || table < 0);


    while (matrix[iterate][table - 1] != _DEFCHAR) {
        iterate--;

        if (iterate < 0)
            break;
    }

    if (xTurn)
        matrix[iterate][table - 1] = 'X';
    else
        matrix[iterate][table - 1] = 'O';
}

bool checkForWinner(char matrix[][MAXLEN], int length, int height) {
    //main diagonal
    for (int i = height - 1; i >= 3; i--) {
        for (int j = 0; j <= length - 3; j++) {
            bool eq = (matrix[i][j] == matrix[i - 1][j + 1]) &&
                (matrix[i - 2][j + 2] == matrix[i - 3][j + 3]) &&
                (matrix[i][j] == matrix[i - 3][j + 3]) &&
                (matrix[i][j] != _DEFCHAR);

            if (eq)
                return eq;
        }
    }

    //secondary diagonal:
    for (int i = height - 1; i >= 3; i--) {
        for (int j = length - 1; j >= 3; j--) {
            bool eq = (matrix[i][j] == matrix[i - 1][j - 1]) &&
                (matrix[i - 2][j - 2] == matrix[i - 3][j - 3]) &&
                (matrix[i][j] == matrix[i - 3][j - 3]) &&
                matrix[i][j] != _DEFCHAR;

            if (eq)
                return eq;
        }
    }

    //row:
    for (int i = 0; i < height; i++) {
        for (int j = 0; j <= length - 4; ++j) {
            bool eq = (matrix[i][j] == matrix[i][j + 1]) &&
                (matrix[i][j + 2] == matrix[i][j + 3]) &&
                (matrix[i][j] == matrix[i][j + 3]) &&
                matrix[i][j] != _DEFCHAR;

            if (eq)
                return eq;
        }
    }
    //col:
    for (int i = 0; i <= height - 4; i++) {
        for (int j = 0; j < length; j++) {
            bool eq = (matrix[i][j] == matrix[i + 1][j]) &&
                (matrix[i + 2][j] == matrix[i + 3][j]) &&
                (matrix[i][j] == matrix[i + 3][j]) &&
                matrix[i][j] != _DEFCHAR;

            if (eq)
                return eq;
        }
    }

    return false;
}

bool checkForRemi(char matrix[][MAXLEN], int length, int height) {
    for (int i = 0; i < height; i++) {
        for (int g = 0; g < length; g++) {
            if (matrix[i][g] == _DEFCHAR)
                return false;
        }
    }
    return true;
}

int main() {
    system("title = Four in a row!");

    char gameboard[MAXHEIGHT][MAXLEN];
    int length = 0; int height = 0;
    bool xTurn = true;
    bool fInput = false;

    do {
        if (fInput)
            std::cout << std::endl
            << "Wrong input! Please try again, buddy" << std::endl
            << "and bear in mind that you have interval, going like" << std::endl <<
            "4 <= length <= 40 and 4 <= heigth <= 20!" << std::endl << std::endl;

        std::cout << "Enter length: ";
        std::cin >> length;
        bool validate = !((bool)(std::cin));
        if (!validate) {
            std::cout << "Enter heigth: ";
            std::cin >> height;
            bool secondValidatin = !((bool)(std::cin));
            if (secondValidatin) {
                std::cout << std::endl << "NO SYMBOLS ALLOWED!\n";
                std::cin.clear();
                std::cin.ignore(255, '\n');
                fInput = false;
            }
        }
        else {
            std::cout << std::endl << "No symbols allowed!";
            std::cin.clear();
            std::cin.ignore(255, '\n');
        }
        fInput = true;
    } while (length < 4 || height < 4 || length >MAXLEN || height > MAXHEIGHT);

    int multiplyIndex = 5;
    int copyLen = length;
    while (copyLen > 0) {
        multiplyIndex--;
        copyLen /= 4;
    }


    initGameboard(gameboard, length, height);
    printBoard(gameboard, length, height);

    while (!checkForWinner(gameboard, length, height) && !checkForRemi(gameboard, length, height)) {
        system("CLS");
        printBoard(gameboard, length, height);
        makeMove(gameboard, length, height, xTurn);
        xTurn = !xTurn;
    }

    system("CLS");
    printBoard(gameboard, length, height);
    std::cout << "Winner: ";
    if (checkForRemi(gameboard, length, height))
        std::cout << "Remi!";
    else if (xTurn)
        std::cout << 'O';
    else
        std::cout << 'X';
}