/*
* Tic-Tac-Toe in ANSI C.
*
* The Tic-Tac-Toe game, is a fun and easy to demonstrate the techniques and array data structures you learned about this chapter
* Moreover, the tic-tac-toe game uses techniques and programming data structures that you learned in previous chapters, such as
* function prototypes, definitions, system calls, and global variables.
*/
#include <stdio.h>
//function prototypes
void displayBoard();
int verifySelection(int,int);
void checkForWin();
//global variables
char board[ 8 ], whoWon = ' ';
int currentPlayer = 0;
//begin main function
int main() {
int i, square;
for(i = 0; i < 9; i++) board[ i ] = ' ';
displayBoard();
while(whoWon == ' ') {
printf("\n%c\n", whoWon);
if(currentPlayer == 0 || currentPlayer == 1) {
printf("\nPlayer X\n");
printf("Enter an available square (1..9)");
scanf("%d", &square);
if(verifySelection(square, currentPlayer) == 1) {
currentPlayer = 1;
} else {
currentPlayer = 2;
}
} else {
printf("\nPlayer 0\n");
printf("Enter an available square (1..9)");
scanf("%d", &square);
if(verifySelection(square, currentPlayer) == 1) {
currentPlayer = 2;
} else {
currentPlayer = 1;
}
}
displayBoard();
checkForWin();
}//end for loop
return (0);
};
void displayBoard() {
system("cls");
printf("\t|\t|\n");
printf("%c\t|%c\t|%c\n", board[0], board[1], board[2]);
printf("--------|-------|--------\n");
printf("\t|\t|\n");
printf("%c\t|%c\t|%c\n", board[3], board[4], board[5]);
printf("--------|-------|--------\n");
printf("%c\t|%c\t|%c\n", board[6], board[7], board[8]);
printf("\t|\t|\n");
};
int verifySelection(int square, int player) {
if((player == 0 || player == 1) && board[square-1] == ' ') {
board[ square - 1 ] = 'X';
return 0;
}
else if(board[square-1] == ' ' && player == 2) {
board[square-1] = 'O';
return 0;
} else
return 1;
}
void checkForWin() {
int i,
contor = 0;
if(board[ 0 ] == 'X' && board[ 1 ] == 'X' && board[ 2 ] == 'X') {
whoWon = 'X';
} else if(board[ 3 ] == 'X' && board[ 4 ] == 'X' && board[ 5 ] == 'X') {
whoWon = 'X';
} else if(board[ 6 ] == 'X' && board[ 7 ] == 'X' && board[ 8 ] == 'X') {
whoWon = 'X';
} else if(board[ 0 ] == 'X' && board[ 3 ] == 'X' && board[ 6 ] == 'X') {
whoWon = 'X';
} else if(board[ 1 ] == 'X' && board[ 4 ] == 'X' && board[ 7 ] == 'X') {
whoWon = 'X';
} else if(board[ 2 ] == 'X' && board[ 5 ] == 'X' && board[ 8 ] == 'X') {
whoWon = 'X';
} else
if(board[ 0 ] == 'O' && board[ 1 ] == 'O' && board[ 2 ] == 'O') {
whoWon = 'O';
} else if(board[ 3 ] == 'O' && board[ 4 ] == 'O' && board[ 5 ] == 'O') {
whoWon = 'O';
} else if(board[ 6 ] == 'O' && board[ 7 ] == 'O' && board[ 8 ] == 'O') {
whoWon = 'O';
} else if(board[ 0 ] == 'O' && board[ 3 ] == 'O' && board[ 6 ] == 'O') {
whoWon = 'O';
} else if(board[ 1 ] == 'O' && board[ 4 ] == 'O' && board[ 7 ] == 'O') {
whoWon = 'O';
} else if(board[ 2 ] == 'O' && board[ 5 ] == 'O' && board[ 8 ] == 'O') {
whoWon = 'O';
}
//for diagonals
if(board[ 0 ] == 'X' && board[ 4 ] == 'X' && board[ 8 ] == 'X') {
whoWon = 'X';
} else if(board[ 2 ] == 'X' && board[ 4 ] == 'X' && board[ 6 ] == 'X') {
whoWon = 'X';
}
if(board[ 0 ] == 'O' && board[ 4 ] == 'O' && board[ 8 ] == 'O') {
whoWon = 'O';
} else if(board[ 2 ] == 'O' && board[ 4 ] == 'O' && board[ 6 ] == 'O') {
whoWon = 'O';
}
if(whoWon == 'X') {
printf("\nX WON\n");
return;
}
if(whoWon == 'O') {
printf("\nO WON\n");
return;
}
for(i = 0; i < 9; i++)
if(board[i] != ' ')
contor++;
if(contor == 9) {
whoWon = 'C';
printf("\nCAT GAME\n");
return;
}
}
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