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C-/C++-Quelltext

/*Tic Tac Toe © */

#include <iostream>
#include <string>

using namespace std;

//Prototypenliste
void drawSpaces();
void drawField();
void Error (string msg);
void checkForWinner();
void checkBusyFields();
//Globale Variablen
char cNumb[10] = {'0','1','2','3','4','5','6','7','8','9'};
int playerTurn = 1;
bool gameOver = false;
bool busyFields =false;
int Winner = 0;
int select = 0;

//Hauptprogramm
int main()
{   
     
     //lokale Variablen 
     char nochmal;

     do 
     {      
           system("cls");
        cout << "\n\n\n\n\n";
           //Feld zeichnen
        drawField();
        cout << "\n\n\n\n\n";
            
        
        cout << "Spieler " << playerTurn << " ist am Zug! Bitte Zahl eingeben. ";
        cin >> select;

        //Error
        if(select < 0 || select > 9)
        {
               cout << endl;
            Error("Falsche Eingabe, erneut eingeben");
        }
          //Felder setzen
          if(playerTurn == 1)
          {
            cNumb[select] = 'X';
          }
          else if(playerTurn == 2)
          {
            cNumb[select] = 'O';
          }

          checkBusyFields();
        checkForWinner();
          if(playerTurn == 1)
        {
            playerTurn = 2;
          }
          else 
          {
            playerTurn = 1;   
          }
            
     } while(gameOver != true && busyFields != true);

     drawSpaces();
     cout << "Spieler " << Winner << " hat gewonnen!!";
     cout << endl;
     cout << "moechten sie erneut spielen ? (j/n) ";
     cin >> nochmal;
    if(nochmal == 'j')
     {
        exit(0);
     }
     else if(nochmal == 'n')
     {
        exit(0);
     }

     system("pause");
     return 0;
}
/*Funktionen */

//Feld zeichnen
void drawField()
{
    drawSpaces();
    cout << cNumb[1] << " | " << cNumb[2] << " | " << cNumb[3] << endl; 
    cout << endl;
    drawSpaces();
    cout << "- + - + - " << endl;
    cout << endl;
    drawSpaces();
    cout << cNumb[4] << " | " << cNumb[5] << " | " << cNumb[6] << endl;
    cout << endl;
    drawSpaces();
    cout << "- + - + - "<< endl;
    cout << endl;
    drawSpaces();
    cout << cNumb[7] << " | " << cNumb[8] << " | " << cNumb[9] << endl;

}
// Überprüfung, ob Feld besetzt ist
void checkBusyFields()
{
    if(cNumb[select] == 'X' || cNumb[select] == 'O')
    {
      
       cout << "----------------------------------------------" << endl;
       cout << " spielfeld ist besetzt. bitte anderes waehlen!" << endl;
       cout << "----------------------------------------------" << endl;

       system("pause");

    }
    
}   
//Leerzeichen zur Zentrierung des Spielfeldes
void drawSpaces()
{
    cout << "                           "; 

}
//Errormessage
void Error (string msg)
{
    cout << msg << endl;

}
//Gewinner Check
void checkForWinner()
{
    if(cNumb[1] == 'X' && cNumb[2] == 'X' && cNumb[3] == 'X' ||
       cNumb[1] == 'O' && cNumb[2] == 'O' && cNumb[3] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
       }
    if(cNumb[4] == 'X' && cNumb[5] == 'X' && cNumb[6] == 'X' ||
       cNumb[4] == 'O' && cNumb[5] == 'O' && cNumb[6] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
       }
    if(cNumb[7] == 'X' && cNumb[8] == 'X' && cNumb[9] == 'X' ||
       cNumb[7] == 'O' && cNumb[8] == 'O' && cNumb[9] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
       }
    if(cNumb[1] == 'X' && cNumb[4] == 'X' && cNumb[7] == 'X' ||
       cNumb[1] == 'O' && cNumb[4] == 'O' && cNumb[7] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
       }
    if(cNumb[3] == 'X' && cNumb[5] == 'X' && cNumb[7] == 'X' ||
       cNumb[3] == 'O' && cNumb[5] == 'O' && cNumb[7] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
       }
    if(cNumb[1] == 'X' && cNumb[5] == 'X' && cNumb[9] == 'X' ||
       cNumb[1] == 'O' && cNumb[5] == 'O' && cNumb[9] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
    }
    if(cNumb[2] == 'X' && cNumb[5] == 'X' && cNumb[8] == 'X' ||
       cNumb[2] == 'O' && cNumb[5] == 'O' && cNumb[8] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
    }
    if(cNumb[3] == 'X' && cNumb[6] == 'X' && cNumb[9] == 'X' ||
       cNumb[3] == 'O' && cNumb[6] == 'O' && cNumb[9] == 'O')
       {
       Winner = playerTurn;
       gameOver = true;
       }
    
}