Mega Code Archive
Tic-Tac-Toe
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#include <stdio.h>
void main()
{
int i = 0; /* Loop counter */
int player = 0; /* Player number - 1 or 2 */
int go = 0; /* Square selection number for turn */
int row = 0; /* Row index for a square */
int column = 0; /* Column index for a square */
int line = 0; /* Row or column index in checking loop */
int winner = 0; /* The winning player */
char board[3][3] = { /* The board */
{'1','2','3'}, /* Initial values are reference numbers */
{'4','5','6'}, /* used to select a vacant square for */
{'7','8','9'} /* a turn. */
};
/* The main game loop. The game continues for up to 9 turns */
/* As long as there is no winner */
for( i = 0; i<9 && winner==0; i++)
{
/* Display the board */
printf("\n\n");
printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);
player = i%2 + 1; /* Select player */
/* Get valid player square selection */
do
{
printf("\nPlayer %d, please enter the number of the square "
"where you want to place your %c: ", player,(player==1)?'X':'O');
scanf("%d", &go);
row = --go/3; /* Get row index of square */
column = go%3; /* Get column index of square */
}while(go<0 || go>9 || board[row][column]>'9');
board[row][column] = (player == 1) ? 'X' : 'O'; /* Insert player symbol */
/* Check for a winning line - diagonals first */
if((board[0][0] == board[1][1] && board[0][0] == board[2][2]) ||
(board[0][2] == board[1][1] && board[0][2] == board[2][0]))
winner = player;
else
/* Check rows and columns for a winning line */
for(line = 0; line <= 2; line ++)
if((board[line][0] == board[line][1] && board[line][0] == board[line][2])||
(board[0][line] == board[1][line] && board[0][line] == board[2][line]))
winner = player;
}
/* Game is over so display the final board */
printf("\n\n");
printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
printf("---+---+---\n");
printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);
/* Display result message */
if(winner == 0)
printf("\nHow boring, it is a draw\n");
else
printf("\nCongratulations, player %d, YOU ARE THE WINNER!\n", winner);
}
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