main.c

#include <gtk/gtk.h>
#include <stdbool.h>
#include <stdlib.h>

//Declare items
GtkWidget *window;
GtkWidget *reset_button;
GtkWidget *result;
GtkWidget *stat;
GtkWidget *buttons[3][3];
GtkWidget *vbox, *grid;

//statistics
int computer = 0, user = 0, turn = 1, state = 0;
//initialize items
void gtk_init_items() {
	//set window
	window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_widget_set_size_request(window, 300, 400);
	gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
	
	//set buttons
	int i, j;
	for(i = 0; i < 3; i++)
		for(j = 0; j < 3; j++) {
			buttons[i][j] = gtk_button_new();
			gtk_widget_set_size_request(buttons[i][j], 100, 100);
		}
	reset_button = gtk_button_new_with_label("Reset");
	result = gtk_label_new("It's your turn to begin.");
	char text[30];
	sprintf(text, "Computer:%d    User:%d", computer, user);
	stat=gtk_label_new(text);
}

//pack items
void gtk_packing() {
	vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);
	grid = gtk_grid_new();
	gtk_container_add(GTK_CONTAINER(window), vbox);
	gtk_box_pack_start(GTK_BOX(vbox), reset_button, 0, 0, 10);
	gtk_box_pack_start(GTK_BOX(vbox), grid, 1, 1, 10);
	gtk_box_pack_start(GTK_BOX(vbox), result, 1, 1, 10);
	gtk_box_pack_start(GTK_BOX(vbox), stat, 1, 1, 10);
	int i, j;
	for(i = 0; i < 3; i++)
		for(j = 0; j < 3; j++)
			gtk_grid_attach(GTK_GRID(grid), buttons[i][j], j, i, 1, 1);

}

//free memory and quit program
void quit() {
	gtk_main_quit();
}
void computer_mark() {
	int i, j;
	while(1) {
		i = random() % 3;
		j = random() % 3;
		if(gtk_button_get_label(GTK_BUTTON(buttons[i][j])) == NULL) {
			gtk_button_set_label(GTK_BUTTON(buttons[i][j]), "0");
			break;
		}
	}	
}
	
//check whether board finished.
bool done() {
	int count = 0, i, j;
	for(i = 0; i < 3; i++)
		for(j = 0; j < 3; j++) {
			if(gtk_button_get_label(GTK_BUTTON(buttons[i][j])) != NULL)
				count++;
		}
	//printf("%d ",count);
	if(count == 9)
		return true;
	else
		return false;
}

//reset all buttons
void reset() {
	int i, j;
	state = 0;
	for(i = 0; i < 3; i++)
		for(j = 0; j < 3; j++) {
			gtk_button_set_label(GTK_BUTTON(buttons[i][j]), "");
			gtk_button_set_label(GTK_BUTTON(buttons[i][j]), NULL);
			//gtk_widget_show(buttons[i][j]);
		}
	if(turn) {
		computer_mark();
		gtk_label_set_text(GTK_LABEL(result), "Game in progress");
		turn = 0;
	}
	else {
		turn = 1;
		gtk_label_set_text(GTK_LABEL(result), "It is your turn to begin");
	}
}
//show failure success tie message
void show_message(int type) {
       	char text[20];
       	switch(type) {
       		case 0:
			sprintf(text, "Game was tie");
       			break;
       		case 1:
			sprintf(text, "You won the game");
       			break;
       		case 2:
			sprintf(text, "Computer won the game");
       	}
       	gtk_label_set_text(GTK_LABEL(result), text);
}
//check whether success or tie
bool check() {

	int a[3][3], i, j;
	for(i = 0; i < 3; i++) {
		for(j = 0; j < 3; j++) {
			const char *text = gtk_button_get_label(GTK_BUTTON(buttons[i][j]));
			if(text == NULL)
				a[i][j] = -1;
			else if(strcmp(text, "X")) {
				a[i][j] = 1;
			}
			else if(strcmp(text, "0")) {
				a[i][j] = 0;
			}
		}
	}
	if(
		(a[0][0] == 0 && a[0][1] == 0 && a[0][2] == 0) || (a[1][0] == 0 && a[1][1] == 0 && a[1][2] == 0) ||
		(a[2][0] == 0 && a[2][1] == 0 && a[2][2] == 0) || (a[0][0] == 0 && a[1][0] == 0 && a[2][0] == 0) ||
		(a[0][1] == 0 && a[1][1] == 0 && a[2][1] == 0) || (a[0][2] == 0 && a[1][2] == 0 && a[2][2] == 0) ||
		(a[0][0] == 0 && a[1][1] == 0 && a[2][2] == 0) || (a[0][2] == 0 && a[1][1] == 0 && a[2][0] == 0)		
	) {
		show_message(1);
		user++;
		state = 1;
		char text[30];
		sprintf(text, "Computer:%d    User:%d", computer, user);
		gtk_label_set_text(GTK_LABEL(stat), text);
		return 0;
	}
	else if(
		(a[0][0] == 1 && a[0][1] == 1 && a[0][2] == 1) || (a[1][0] == 1 && a[1][1] == 1 && a[1][2] == 1)||
		(a[2][0] == 1 && a[2][1] == 1 && a[2][2] == 1) || (a[0][0] == 1 && a[1][0] == 1 && a[2][0] == 1)||
		(a[0][1] == 1 && a[1][1] == 1 && a[2][1] == 1) || (a[0][2] == 1 && a[1][2] == 1 && a[2][2] == 1)||
		(a[0][0] == 1 && a[1][1] == 1 && a[2][2] == 1) || (a[0][2] == 1 && a[1][1] == 1 && a[2][0] == 1)		
	) {
		show_message(2);
		computer++;
		state = 1;
		char text[30];
		sprintf(text, "Computer:%d    User:%d", computer, user);
		gtk_label_set_text(GTK_LABEL(stat), text);
		return 0;
	}
	else if(done()) {
		show_message(0);
		state = 1;
		turn = (turn) ? 0 : 1;
		return 0;
	}
	return 1;
}
		
//mark buttons if clicked
int mark(GtkWidget *button) {
	if(state)
		return 0;
	if(gtk_button_get_label(GTK_BUTTON(button)) == NULL) {
		gtk_button_set_label(GTK_BUTTON(button), "X");
		gtk_label_set_text(GTK_LABEL(result), "Game in progress");
	}
	else {
		return 0;
	}
	if(check()) {
		computer_mark();
		check();
	}
	return 0;
}
//connect signals
void gtk_init_signals() {
	g_signal_connect(window, "destroy", quit, NULL);
	int i, j;
	for(i = 0; i < 3; i++)
		for(j = 0; j < 3; j++)
			g_signal_connect(buttons[i][j], "clicked", G_CALLBACK(mark), buttons[i][j]);
	g_signal_connect(reset_button, "clicked", G_CALLBACK(reset), NULL);
} 

int main(int argc, char *argv[]) {
	gtk_init(&argc, &argv);
	gtk_init_items();
	gtk_packing();
	gtk_init_signals();
	gtk_widget_show_all(window);
	gtk_main();
}