[answered] Checking value of several slots in array with Switch statement?

[namethief]

I am new to C++ and I am trying to put together a little tic tac toe game. I have it figured out except for validating whether there is a winner. I have 9 slots in an array, they start as numbers but get changed to X or O as char type.

/*
Tic Tac Toe
by namethief
01/29/15
*/


#include <iostream>
using namespace std;

int main(){

bool gameOver = false;
char whosTurn = 'X';
int sel = 0;

char spot[9];       //declaring values of spots in array
    spot[0] = '1';
    spot[1] = '2';
    spot[2] = '3';
    spot[3] = '4';
    spot[4] = '5';
    spot[5] = '6';
    spot[6] = '7';
    spot[7] = '8';
    spot[8] = '9';


    do{
        cout << "\n\n\n\n " << spot[0] << " | " << spot[1] << " | " << spot[2] << "\n" <<
        "-----------\n" <<                                                  // This will print
        " " << spot[3] << " | " << spot[4] << " | " << spot[5] << "\n" <<  // the game board
        "-----------\n" <<
        " " << spot[6] << " | " << spot[7] << " | " << spot[8] << "\n" << endl;

        cout << "\n" << whosTurn << "'s turn. Please enter the number of the" <<
         "spot you would like to mark." << endl; // User input spot they want to play
        cin >> sel;

        if(spot[sel - 1] == 'X' || spot[sel - 1] == 'O'){ // check to see if space is available

            cout << "\n\n\n\nSeat's taken! Try again." << endl;

        }else{
            spot[sel - 1] = whosTurn;}           // place a marker on spot selected



                    if(whosTurn == 'X'){                // change player for next turn
                            whosTurn = 'O';
                        }else{
                            whosTurn = 'X';
                        }

        }while(gameOver == false);


return 0;


}

I want to use a switch statement between "Place a marker" and "change player" to check all possible winning scenarios. (I know I need to make sure the change player portion only occurs if there is not a winner). The only example of switch I can find only uses one variable, but I am imagining something like:

switch(spot[0-8]){

  case spot[0] == 'X' && spot[1] == 'X' && spot[2] == 'X':
  gameOver = True;
  cout << whosTurn << " wins!" << endl;
  break;

Case ..etc.... 
default:

// change player
}

But that is not working. Any thoughts? Thanks in advance! I'm having a lot of fun playing with C++!

-namethief

[firedraco]

You can't. A switch only works for a single variable; if you need to check multiple variables, use an if statement.

[namethief]

Thank you for the info. Will keep that in mind.

[namethief]

For any other beginners who may be interested in seeing what my "final" version looks like, I'll paste it below. I use quotation marks around final because it is not programmed to detect a full board lacking a winner.

/*
Tic Tac Toe
by namethief
01/29/15
*/


#include <iostream>
using namespace std;

int main(){

bool gameOver = false;
char whosTurn = 'X';
int sel = 0;

char spot[9];       //declaring values of spots in array
    spot[0] = '1';  //to be used as the 9 squares in game
    spot[1] = '2';
    spot[2] = '3';
    spot[3] = '4';
    spot[4] = '5';
    spot[5] = '6';
    spot[6] = '7';
    spot[7] = '8';
    spot[8] = '9';

    do{
        cout << "\n\n\n\n " << spot[0] << " | " << spot[1] << " | " << spot[2] << "\n" <<
        "-----------\n" <<                                                  // This will print
        " " << spot[3] << " | " << spot[4] << " | " << spot[5] << "\n" <<   // the game board
        "-----------\n" <<                                                  //to console
        " " << spot[6] << " | " << spot[7] << " | " << spot[8] << "\n" << endl;

        cout << "\n" << whosTurn << "'s turn. Please enter the number of the " <<
         "spot you would like to mark." << endl; // User input spot they want to play
        cin >> sel;

              // check to see if space is available
        if(spot[sel - 1] == 'X' || spot[sel - 1] == 'O' || sel > 9 || sel < 1){
            cout << "\n\n\n\nSeat's taken! Try again." << endl;

        }else{
            spot[sel - 1] = whosTurn;           // place a marker on spot selected

         if(spot[0] == 'X' && spot[1] == 'X' && spot[2] == 'X'){         //check
        gameOver = true;                                                //all
        }else if(spot[3] == 'X' && spot[4] == 'X' && spot[5] == 'X'){   //possible
        gameOver = true;                                                //winning
        }else if(spot[6] == 'X' && spot[7] == 'X' && spot[8] == 'X'){   //scenarios
        gameOver = true;
        }else if(spot[0] == 'X' && spot[3] == 'X' && spot[6] == 'X'){
        gameOver = true;
        }else if(spot[1] == 'X' && spot[4] == 'X' && spot[7] == 'X'){
        gameOver = true;
        }else if(spot[2] == 'X' && spot[5] == 'X' && spot[8] == 'X'){
        gameOver = true;
        }else if(spot[0] == 'X' && spot[4] == 'X' && spot[8] == 'X'){
        gameOver = true;
        }else if(spot[6] == 'X' && spot[4] == 'X' && spot[2] == 'X'){
        gameOver = true;
        }else if(spot[0] == 'O' && spot[1] == 'O' && spot[2] == 'O'){
        gameOver = true;
        }else if(spot[3] == 'O' && spot[4] == 'O' && spot[5] == 'O'){
        gameOver = true;
        }else if(spot[6] == 'O' && spot[7] == 'O' && spot[8] == 'O'){
        gameOver = true;
        }else if(spot[0] == 'O' && spot[3] == 'O' && spot[6] == 'O'){
        gameOver = true;
        }else if(spot[1] == 'O' && spot[4] == 'O' && spot[7] == 'O'){
        gameOver = true;
        }else if(spot[2] == 'O' && spot[5] == 'O' && spot[8] == 'O'){
        gameOver = true;
        }else if(spot[0] == 'O' && spot[4] == 'O' && spot[8] == 'O'){
        gameOver = true;
        }else if(spot[6] == 'O' && spot[4] == 'O' && spot[2] == 'O'){
        gameOver = true;
        }else{                  // if no winner:
        if(whosTurn == 'X'){    // change player for next turn
            whosTurn = 'O';
        }else{
            whosTurn = 'X';
        }}}
    }while(gameOver == false);

cout << "\n\n\n\n " << spot[0] << " | " << spot[1] << " | " << spot[2] << "\n" <<
        "-----------\n" <<                                                  // This will print
        " " << spot[3] << " | " << spot[4] << " | " << spot[5] << "\n" <<  // the game board
        "-----------\n" <<
        " " << spot[6] << " | " << spot[7] << " | " << spot[8] << "\n\n\n" << endl;

cout << whosTurn << " wins!!!" << endl; // Declare winner
return 0; // end program


}

This is what the game board ends up looking like:

1 | 2 | 3
-----------
4 | 5 | 6
-----------
7 | 8 | 9

with numbers changing to X's and O's as they are entered.