Programming Challenge: Noughts and Crosses

I just got finished with my first program (that is, the first one I haven't just copied out of a book). It's a text based version of Noughts and Crosses (aka Tic-tac-toe) without an AI, and it looks pretty ugly to me. Commenting is half-assed, some variables are given nondescript names, and I can tell that my loop structure can use a little work. Still, it runs.

Show me up, /prog/. Write a more elegant version in the language of your choice. Surely it's not a difficult task for [o][u]EXPERT PROGRAMMERS[/o][/u] such as yourselves. If you've got any suggestions for me, those would be nice, too.


//Noughts and crosses

#include <iostream>
using namespace std;

//Displays board on screen
void dispboard (char d[9]) {
     cout << " " << d[0] << " | " << d[1] << " | " << d[2] << "\n";
     cout << "---+---+---\n";
     cout << " " << d[3] << " | " << d[4] << " | " << d[5] << "\n";
     cout << "---+---+---\n";
     cout << " " << d[6] << " | " << d[7] << " | " << d[8] << "\n";
}

//Horizontal checker function of checkboard
int horicheck (char x[9], char y, int z) {
     if (x[z] == y) {
             if (x[z+1] == y) {
                       if (x[z+2] == y)
                          return 1;
                      
                       else
                           return 0;
             }
             else
                 return 0;
     }
     else
         return 0;
}

//Vertical checker function of checkboard
int verticheck (char x[9], char y, int z) {
     if (x[z] == y) {
             if (x[z+3] == y) {
                       if (x[z+6] == y)
                          return 1;
                      
                       else
                           return 0;
             }
             else
                 return 0;
     }
     else
         return 0;
}

//Top-left to bottom-right diagonal checker function of checkboard
int diagcheck1 (char x[9], char y, int z) {
     if (x[z] == y) {
             if (x[z+4] == y) {
                       if (x[z+8] == y)
                          return 1;
                      
                       else
                           return 0;
             }
             else
                 return 0;
     }
     else
         return 0;
}

//Top-right to bottom-left diagonal checker function of checkboard
int diagcheck2 (char x[9],char y,int z) {
     if (x[z] == y) {
             if (x[z+2] == y) {
                       if (x[z+4] == y)
                          return 1;
                      
                       else
                           return 0;
             }
             else
                 return 0;
     }
     else
         return 0;
}
            
//Checks board for a win condition
//Uses horicheck, verticheck, diagcheck1, and diagcheck2
int checkboard (char a[], char b) {
     if (horicheck (a,b,0) == 1)
        return 1;
     else if (horicheck (a,b,3) == 1)
          return 1;
     else if (horicheck (a,b,6) == 1)
          return 1;
     else if (verticheck (a,b,0) == 1)
          return 1;
     else if (verticheck (a,b,3) == 1)
          return 1;
     else if (verticheck (a,b,6) == 1)
          return 1;
     else if (diagcheck1 (a,b,0) == 1)
          return 1;
     else if (diagcheck2 (a,b,2) == 1)
          return 1;
     else
         return 0;
}

int main () {
    char board[9] = {' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '};
    char curplayer = 'X';
    int done;
    char winner = 'q';
    int turn;
    int fin = 0;
   
    cout << "Noughts and Crosses\n\n";
   
    cout << " 0 | 1 | 2\n---+---+---\n 3 | 4 | 5\n---+---+---\n 6 | 7 | 8\n";
    cout << "To place your nought or cross in a square, type the location of\nits square, as seen above.\n\n";
   
    do {
        cout << curplayer << "'s turn!\n";
        dispboard (board);
        done = 0;
        while (done == 0) {
              cout << "Player " << curplayer << ", please type the location of the square that\n";
              cout << "you wish to place a '" << curplayer << "'this turn. ";
              cin >> turn;
              if (turn >= 0 && turn < 9) {
                 if (board[turn] == ' ') {
                    board[turn] = curplayer;
                    done = 1;
                    cout << "\n'" << curplayer << "' placed!\n";
                 }
                 else
                     cout << "\nThere is already a nought or cross at that location.\n";
              }
               
              else
                  cout << "\nYou did not specifiy a valid square. Locations range from 0 to 8,\nwith 0 being the upper left square and 8 being the bottom left.\n";
          }
         
          if (checkboard (board, 'X') == 1)
                         winner = 'X';
          else if (checkboard (board, 'Y') == 1)
               winner = 'O';
              
          else {
               if (curplayer == 'X')
                  curplayer = 'O';
               else
                   curplayer = 'X';
          }
    } while (winner == 'q');
   
    cout << "Player " << winner << " won the game!";
           
    return 0;
}