#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

//Function prototypes
void showBoard();
void input(char *marker);

//Global
char board[3][3] = {{'#','#','#'},{'#','#','#'},{'#','#','#'}};

int main(void)
{
    char marker;
    char *ptrMarker = &marker;

    while (true)
    {
          showBoard();
          input(ptrMarker);

    }
}

void showBoard()
{
     printf(" 123\n");
     for(int y = 0; y < 3; y++)
     {
             if(y > 0){ printf("\n"); }
             printf("%d", y+1);
             for(int x = 0; x < 3; x++)
             {
                    printf("%c", board[x][y]);
             }
     }
}

void input(char *marker)
{
     if(  *marker == 'X')
         *marker = 'O';
     else
         *marker = 'X';


     char input[3];

     while( true )
     {
            printf("\n");
            printf("%c", *marker);
            scanf("%s", &input);

            if( isdigit(input[0]) && isdigit(input[1])) //Input form xy
            {
                board[input[0]-1][input[1]-1] = *marker;
                break;
            }
            else if( isdigit(input[0]) && isdigit(input[2])) //Input form x,y or x:y, etc
            {
                board[input[0]-1][input[2]-1] = *marker;
                break;
            }
     }
}