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tictactoe.c
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tictactoe.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
char board[3][3]={
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'}
};
char init_board[3][3]={
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'}
};
void p_board() {
printf("%c|%c|%c", board[0][0], board[0][1], board[0][2]);
printf("\n=====\n");
printf("%c|%c|%c", board[1][0], board[1][1], board[1][2]);
printf("\n=====\n");
printf("%c|%c|%c\n", board[2][0], board[2][1], board[2][2]);
}
int change_board(int one, int two, char change) {
//first checks to ensure that it isn't already used
if(board[one][two] != init_board[one][two])
return 1;
board[one][two]=change;
return 0;
}
char check() {
int i, q, nc=0;
char ret;
//checks all horizontal lines
for(i=0; i < 3; i++) {
if(board[i][0]==board[i][1] && board[i][0]==board[i][2]) {
ret=board[i][0];
return ret;
}
}
//checks all vertical lines
for(i=0; i < 3; i++) {
if(board[0][i]==board[1][i] && board[0][i]==board[2][i]) {
ret=board[0][i];
return ret;
}
}
//diagonal number 1 "\"
if(board[0][0]==board[1][1] && board[0][0]==board[2][2]) {
ret=board[0][0];
return ret;
}
//diagonal number 2 "/"
if(board[0][2]==board[1][1] && board[0][2]==board[2][0]) {
ret=board[0][2];
return ret;
}
//check if board is full
for(i=0; i < 3; i++) {
for(q=0; q < 3; q++) {
if(board[i][q] == init_board[i][q]) {
nc++;
}
}
}
if(nc==0)
return 'f';
return '0';
}
void bot(char bott) {
if(check() != '0')
return;
int num, i=0, same;
//tries to randomise output
num=(rand() % 9);
while(num > 3) {
num -= 3;
i++;
}
same=change_board(i, num, bott);
if(same==1)
bot(bott);
return;
}
int main() {
srand(time(0));
char player='0', opponent;
int ip=0, i, same;
char w_condition='0';
while( player != 'X' && player != 'O') {
printf("please select X or O\n");
printf("X/O> ");
player=getchar();
}
//init opponent according to what player has chosen
if(player=='X')
opponent='O';
else
opponent='X';
while(w_condition == '0') {
i=0;
p_board();
printf("choose a number from 1-9\n");
scanf("%d", &ip);
//checks if input is valid
if(ip < 10 && ip > 0) {
ip--;
while(ip > 3) {
ip -= 3;
++i;
}
}
else
continue;
same=change_board(i, ip, player);
w_condition=check();
if(w_condition != '0')
break;
if(same==1)
continue;
bot(opponent);
w_condition=check();
}
if(w_condition==player) {
p_board();
printf("You win!\n");
return 0;
}else if(w_condition==opponent) {
p_board();
printf("GG! try harder next time!\n");
return 1000;
}else if(w_condition=='f') {
p_board();
printf("Game has ended with a draw\n");
return 0;
}
return 0;
}