Tic Tac Toe in C++ Program

This Program is Tic Tac Toe game which contain following Variables and functions.

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Variables

char space: It’s an array of type character and represent the positions on the table for game, the table consist of 9 position where user can input his choice.

int p: “p” represents the Player. This game is for two players.

int ch: “ch” represents choice that where the user wants to input his move, the possible inputs are from 1-9.

int i: “i” variable determines if a user won, or not!

char mark: “mark” convert the user input as “X” or “O”, based on the turn of user!

char m: “m” comes in play when a game is over, and takes user input, that whether he wanna play more or not!

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Functions

void board(): This function initializes the board. Refreshes every time user enters his input.

void check(): This function runs on every input and checks to see if there is a Win, or all of the board is complete.

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Program

#include<iostream.h>
#include<conio.h>

void board();
int check();

char space[10]={'0','1','2','3','4','5','6','7','8','9'};

void main(){
 int p=1,ch,i;
 char mark,m;
 do{
  clrscr();
  for(int j=0;j<10;j++){
  space[j]=j+ '0';
  }
  do{

   clrscr();
   board();
   p=(p%2)?1:2;
   cout<<"Player "<<p<<", enter your move: ";    
                        cin>>ch;
   mark=(p==1)?'X':'O';
   if (ch == 1 && space[1] == '1')
    space[1] = mark;
   else if (ch == 2 && space[2] == '2')
    space[2] = mark;
   else if (ch == 3 && space[3] == '3')
    space[3] = mark;
   else if (ch == 4 && space[4] == '4')
    space[4] = mark;
   else if (ch == 5 && space[5] == '5')
    space[5] = mark;
   else if (ch == 6 && space[6] == '6')
    space[6] = mark;
   else if (ch == 7 && space[7] == '7')
    space[7] = mark;
   else if (ch == 8 && space[8] == '8')
    space[8] = mark;
   else if (ch == 9 && space[9] == '9')
    space[9] = mark;
   else
   {
    cout<<"Invalid move ";
    p--;
    cin.ignore();
    cin.get();
   }
   i=check();
   p++;
  }while(i==-1);

  p=(p%2)?2:1;
cout<<"\nCongratulations!!!Player "<<p<<" with mark \""<<mark<<"\" Won";

cout<<"\n\nWanna play more?? Enter \"y\" for Yes: ";   

cin>>m;

}while(m=='y'||m=='Y');

getch();
}

/*Initialize the 3*3 board*/

void board(){
cout<<"\n\nTIC TAC TOE\n\n";
cout<<"  "<<space[1]<<"|"<<space[2]<<"|"<<space[3]<<endl;
cout<<"  "<<"------"<<endl;
cout<<"  "<<space[4]<<"|"<<space[5]<<"|"<<space[6]<<endl;
cout<<"  "<<"------"<<endl;
cout<<"  "<<space[7]<<"|"<<space[8]<<"|"<<space[9]<<endl;
cout<<"  "<<"------"<<endl;
}

/*Check to see if a user wins*/
int check()
{
 if (space[1] == space[2] && space[2] == space[3])
  return 1;
 else if (space[4] == space[5] && space[5] == space[6])
  return 1;
 else if (space[7] == space[8] && space[8] == space[9])
  return 1;
 else if (space[1] == space[4] && space[4] == space[7])
  return 1;
 else if (space[2] == space[5] && space[5] == space[8])
  return 1;
 else if (space[3] == space[6] && space[6] == space[9])
  return 1;
 else if (space[1] == space[5] && space[5] == space[9])
  return 1;
 else if (space[3] == space[5] && space[5] == space[7])
  return 1;
 else if(space[1] != '1' && space[2] != '2' && space[3] != '3' && 
                space[4] != '4' && space[5] != '5' && space[6] != '6' && 
                space[7] != '7' && space[8] != '8' && space[9] != '9')
  return 0;
 else
  return -1;
}