Tic Tac Toe for Terminal

#include <iostream>
#include <string>
#include <stdio.h>

void printBoard();
void resetBoard();
bool checkSpace(int);
bool checkForWin(int);
void setSpace(int, char);

using namespace std;

char spaces[9];
bool in_progress = true;
int turn = 0;
char playerTurn = 'X';

int main ()
{
    // print out title
    cout << endl << "\tT I C \n\tT A C \n\tT O E " << endl << "    ~For Terminal~" << endl << endl;

    resetBoard();

    // while game is in session
    while (in_progress) {
        int spaceNum;
        bool noValidInput = true;
        string temp = "";

        printBoard();
        while (noValidInput) { // waits for player to select valid and empty space on board
            cout << "Player (" << playerTurn << "), enter your choice space: [1-9]\n";
            getline(cin, temp);
            cout << endl;
            spaceNum = stoi(temp);
            if (spaceNum > 0 || spaceNum < 10) {
                if (checkSpace(spaceNum)) {
                    setSpace(spaceNum, playerTurn);
                    noValidInput = false;
                }
            } else {
                cout << "Error: invalid input\n";
            }
        }
        system("clear");

        if (checkForWin(turn)) {
            cout << "Player (" << playerTurn << ") has won!\n";
            printBoard();
            in_progress = false;
        }

        if (playerTurn == 'X') {
            playerTurn = 'O';
        } else if (playerTurn == 'O') {
            playerTurn = 'X';
        } else {
            cout << "Fatal Error; Error Code: \"Dinosaur\"";
            in_progress = false;
        }
        turn++;
        if (turn >= 9 && in_progress) {
            cout << "Tie!\n";
            printBoard();
            in_progress = false;
        }
    }

    return(0);
}

bool checkForWin(int turn) {
    // no way to win prior to turn 4
    if (turn < 4) {
        return false;
    }

    // check rows
    if ((spaces[0] != '_') && (spaces[0] == spaces[1] && spaces[0] == spaces[2])) {
        return true;
    } else if ((spaces[3] != '_') && (spaces[3] == spaces[4] && spaces[3] == spaces[5])) {
        return true;
    } else if ((spaces[6] != '_') && (spaces[6] == spaces[7] && spaces[6] == spaces[8])) {
        return true;
    }

    // check columns
    if ((spaces[0] != '_') && (spaces[0] == spaces[3] && spaces[0] == spaces[6])) {
        return true;
    } else if ((spaces[1] != '_') && (spaces[1] == spaces[4] && spaces[1] == spaces[7])) {
        return true;
    } else if ((spaces[2] != '_') && (spaces[2] == spaces[5] && spaces[2] == spaces[8])) {
        return true;
    }

    // check diagonals
    if ((spaces[0] != '_') && (spaces[0] == spaces[4] && spaces[0] == spaces[8])) {
        return true;
    } else if ((spaces[2] != '_') && (spaces[2] == spaces[4] && spaces[2] == spaces[6])) {
        return true;
    }

    return false;
}

// checkSpace determines if space is already owned
bool checkSpace(int spaceValue) {
    if (spaces[spaceValue - 1] == '_') {
        return true;
    } else {
        cout << "Space (" << spaceValue << ") has already been selected.\n";
        return false;
    }
}

// setSpace sets the current player's character to spaces array
void setSpace(int spaceValue, char playerChar) {
    spaces[spaceValue - 1] = playerChar;
    cout << "Space (" << spaceValue << ") has been set to: " << playerChar << endl;
}

// resetBoard clears the array and sets turn count to 0
void resetBoard() {
    turn = 0;
    playerTurn = 'X';
    for (int i = 0; i < 9; i ++) {
        spaces[i] = '_';
    }
}

// printBoard displays the spaces array as tic-tac-toe board for players
void printBoard() {
    cout << endl;
    for (int i = 0; i < 9; i ++) {
        if ((i + 3) % 3 == 0) {
            cout << "\t";
        }
        cout << spaces[i] << " ";
        if ((i + 1) % 3 == 0) {
            cout << endl;
        }
    }
    cout << endl;
}