/* Filename: HW5.c */
/* This program plays tic tac toe */


/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Date : 02/17/2007                                              *
 * Section Number: B36                                            * 
 * Filename: HW5.c                                                *
 * Description: This program plays tic tac toe				      *
 * Code from example tictac toe program by john robinson          *
 ******************************************************************/

#include <stdio.h>

void   print_board( char a[3][3]);   		// print board prototype
int    getMove( int a[3][3]);		// get user move function prototype
int    getMove2( int a[3][3]);		// get user move function prototype


int main(void)
{
  int board[3][3];
  int play=1;	
  int movenumber = 1;



   printf("\n    |   |   \n");
   printf(" ---+---+---\n");
   printf("    |   |   \n");
   printf(" ---+---+---\n");
   printf("    |   |   \n\n");

do 



		if(movenumber % 2) 					   			 

					 {
							{				         			
								play = getMove( board );			// Get move from the user and  
								if( play == 0)						// check if user wants to quit
									break;

								movenumber = movenumber + 1;

							}		
						
					 } 

				else  
					 { 
							{				         			
								play = getMove2( board );			// Get move from the user and  
								if( play == 0)						// check if user wants to quit
									break;

								movenumber = movenumber + 1;

							 }		

					 }




while(play == 1);				// bottom do loop

   return 0;		
}										// end main




/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Name: print_board                                              *
 * Function:  print_board function:  Prompts user for next move of*
 *  X.															  *
 * Algorithm: This function is a series of printf statements.     *
 * Input: none                                                    *
 * Output: changes the global variable choice, so no real output  *
 *                                                                *
 ******************************************************************/

void  print_board( int a[3][3] )
{
   	int i, j;						// i and column indices
	printf("\n");					// blank line preceeding
   	for ( i=0; i<3; i++)			//  3 rows, one at a time
   	{				
		if ( i != 0)     printf("\n---+---+---\n");	//  line between rows
      	for (j = 0; j<3; j++)						//  print along i 
	  	{
			if (j != 0)  printf(" |");        // print a "|" between columns
	        if (a[i][j] == 0)      printf(" X");
        	else if (a[i][j] == 1) printf(" O");
 			else                   printf("  ");
      	}
   }
   printf("\n\n");						// blank line following
}









/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Name: getMove                                                  *
 * Function: This function receives move from user                *
 * Algorithm:   receives move from user                           *
 *                                                                *
 ******************************************************************/

int getMove( int a[3][3] )
{
	int valid = 0, play = 1 ;		// set move flag to not valid; 
									// play flag to play


	while ((valid ==0)&&(play==1))	// loop until valid move or quit entry
	{	


	int i,j;
	printf("Player ""X"" enter your Move:\n");
	printf("Row = ");
	scanf("%d", &i);

		if( i == -1 ) 
		{	play = 0;
			break;
		}
		else if((i>=0)&&(i<3))	// get column
		{printf("Col  = ");
	     scanf("%d", &j);}


      	{    a[i][j] = 0;		// make move
		     valid = 1;				// set valid flag to exit while
		     print_board( a );       // display board with new move

     	}									
	}								// end while loop

       return play;		            //  return quit/no quit flag 
}									// end function







/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Name: getMove                                                  *
 * Function: This function receives move from user                *
 * Algorithm:   receives move from user                           *
 *                                                                *
 ******************************************************************/

int getMove2( int a[3][3] )
{
	int valid = 0, play = 1 ;		// set move flag to not valid; 
									// play flag to play


	while ((valid ==0)&&(play==1))	// loop until valid move or quit entry
	{	


	int i,j;
	printf("Player ""O"" enter your Move:\n");
	printf("Row = ");
	scanf("%d", &i);

		if( i == -1 ) 
		{	play = 1;
			break;
		}
		else if((i>=0)&&(i<3))	// get column
		{printf("Col  = ");
	     scanf("%d", &j);}


									// check; selected cell blank ?

      	{    a[i][j] = 1;		// make move
		     valid = 1;				// set valid flag to exit while
		     print_board( a );       // display board with new move

     	}									
	}								// end while loop

       return play;		            //  return quit/no quit flag 
}									// end function