/***********************************************************
 * Snake Game
 *  Programed by. Team CheVaLieR in Hoseo Univ.
 ***********************************************************/

//Å°±¸ºÐ
#define FUNCTION_KEY	0x00
#define EXTENSION_KEY	0xe0
//¹æÇâÅ°
#define KEY_LEFT		0x4b
#define KEY_RIGHT		0x4d
#define KEY_UP			0x48
#define KEY_DOWN		0x50
//¿É¼ÇÅ°
#define KEY_ESC			0x1b
#define KEY_F2			0x3c
#define KEY_F4			0x3e
//¹æÇ⼺ È®ÀÎ
#define VECTOR_RIGHT	 1
#define VECTOR_LEFT		-1
#define VECTOR_UP		 2
#define VECTOR_DOWN		-2

#define BORDER_LEFT		 1
#define BORDER_RIGHT	74
#define BORDER_TOP		 1
#define BORDER_BOTTOM	21

#define STATUS_DEAD		-1
#define STATUS_EAT		 1
#define STATUS_NONE		 0

#define DEFAULT_SPEED	150
#define MINIMUM_SPEED	 50

#define SNAKE_MAX_LENGTH	740

#define PRINT_XY_NUM(x, y, num)		\
	gotoxy(x, y);					\
	printf("%d", num);				\
	gotoxy(77,0);

#define PRINT_XY_STR(x, y, str)		\
	gotoxy(x, y);					\
	printf("%s", str);				\
	gotoxy(77,0);

#define CLEAR_SCREEN()	system ("cls")

/* declaration */
struct __position__ {
	int x;
	int y;
};

typedef struct __position__ SNAKE;
typedef struct __position__ FOOD;

void init();
void make_line();
int move(int vector);
void gotoxy(int x, int y);
void game_over();
int check();
void make_food();