Snake (release)

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <conio.h>
#include <Windows.h>
#include <locale.h>
#define LEN 20//длина
#define WID 20//ширина

int play = 0;

typedef struct Snake {
    int x_coordinate;
    int y_coordinate;
    char symbol;
    char route;
    int speed;
    int size;
    int tailX[100], tailY[100];
} PSnake;

typedef struct Fruit
{
    int x_coordinate;
    int y_coordinate;
    char symbol;
} PFruit;
void change_route(int code, PSnake *s);
void snake_logic(PSnake *s, PFruit *f, int *score);
void Draw(PSnake *s, PFruit *f, int *score);
int random(int a, int b);
void start_settings(PSnake *s, PFruit *f);

int main()
{
    setlocale(LC_ALL, "Rus");
    srand(time(NULL));
    int i, j, k, c = 0, score = 0;
    PSnake s;
    PFruit f;

    start_settings(&s, &f);

    int flag;
    printf("Для начала игры нажмите любую клавишу\n");
    _getch();
    while (!play)
    {
        Draw(&s, &f, &score);
        if (_kbhit()) {
            c = _getch();
            if (c == 27){
                play = 1;
                continue;
            }
            change_route(c, &s);

        }

        snake_logic(&s, &f, &score);
    }
    printf("Игра окончена\nНабрано очков: %d\n", score);
    system("pause");
    return 0;
}

void change_route(int code, PSnake *s)
{
    switch (code)
    {
    case 119: /*s->x_coordinate--;*/ s->route = 'u'; break;//Вверх
    case 100: /*s->y_coordinate++;*/ s->route = 'r'; break;//Вправо
    case 97: /*s->y_coordinate--;*/ s->route = 'l'; break;//Влево
    case 115:/* s->x_coordinate++;*/ s->route = 'd'; break;//Вниз
    default: break;
    }
    return;
}

void snake_logic(PSnake * s, PFruit * f, int * score)
{
    int prevX = s->tailX[0], prevY = s->tailY[0];
    int prev2X, prev2Y, i;

    s->tailX[0] = s->x_coordinate;
    s->tailY[0] = s->y_coordinate;

    for (i = 1; i < s->size; i++)
    {
        prev2X = s->tailX[i];
        prev2Y = s->tailY[i];
        s->tailX[i] = prevX;
        s->tailY[i] = prevY;
        prevX = prev2X;
        prevY = prev2Y;
    }
/*---------------------------*/
    char symbol = s->route;
    switch (symbol)
    {
    case 'u': s->x_coordinate--; /*s->route = 'u';*/ break;//Вверх
    case 'r': s->y_coordinate++; /*s->route = 'r';*/ break;//Вправо
    case 'l': s->y_coordinate--; /*s->route = 'l';*/ break;//Влево
    case 'd': s->x_coordinate++;/* s->route = 'd';*/ break;//Вниз
    default: break;
    }
    /*--------------------*/
    if (s->x_coordinate >= WID)
        s->x_coordinate = 0;
    else if (s->x_coordinate < 0)
        s->x_coordinate = WID - 1;

    if (s->y_coordinate >= LEN)
        s->y_coordinate = 0;
    else if (s->y_coordinate < 0)
        s->y_coordinate = LEN - 1;
/*----------------------------------*/
    if ((s->x_coordinate == f->x_coordinate) && (s->y_coordinate == f->y_coordinate))
    {
        *score += 10;
        s->size++;
        f->x_coordinate = random(1, WID - 2);
        f->y_coordinate = random(1, LEN - 2);
        while (f->x_coordinate == s->x_coordinate && f->y_coordinate == s->y_coordinate)
        {
            f->x_coordinate = random(1, WID - 2);
            f->y_coordinate = random(1, LEN - 2);
        }
        if (s->speed - 10 != 0)
            (s->speed) -= 10;
    }
    for (i = 0; i < s->size; i++) {
        if (s->tailX[i] == s->x_coordinate && s->tailY[i] == s->y_coordinate)
            play = 1;
    }
}

void Draw(PSnake *s, PFruit *f, int *score) {
    int flag;
    Sleep(s->speed);    //speed of game
    system("cls");
    for (int i = 0; i < WID + 2; i++)
        printf("#");
    printf("\n");

    for (int i = 0; i < LEN; i++) {
        for (int j = 0; j <= WID; j++) {
            if (j == 0 || j == WID )
                printf("#");
            if (i == s->x_coordinate && j == s->y_coordinate)
                printf("%c", s->symbol);
            else if (i == f->x_coordinate && j == f->y_coordinate)
                printf("%c", f->symbol);
            else {
                flag = 0;
                for (int k = 0; k < s->size; k++) {
                    if (s->tailX[k] == i && s->tailY[k] == j) {
                        flag = 1;
                        printf("%c", s->symbol);;
                    }
                }
                if (!flag)
                    printf(" ");
            }
        }
        printf("\n");
    }

    for (int i = 0; i < WID + 2; i++)
        printf("#");
    printf("\nScore: %d\n", *score);
}

void start_settings(PSnake *s, PFruit *f)
{
    s->symbol = '0';
    s->x_coordinate = WID / 2;
    s->y_coordinate = LEN / 2;
    s->tailX[0] = WID / 2;
    s->tailY[0] = LEN / 2;
    s->speed = 200;
    s->size = 0;
    s->route = 0;

    f->symbol = '*';

    f->x_coordinate = random(1, WID - 2);
    f->y_coordinate = random(1, LEN - 2);
    while(f->x_coordinate == s->x_coordinate && f->y_coordinate == s->y_coordinate)
    {
        f->x_coordinate = random(1, WID - 2);
        f->y_coordinate = random(1, LEN - 2);
    }

    return;
}

int random(int a, int b)
{
    srand(time(NULL));
    if (a > 0) return a + rand() % (b - a);
    else return a + rand() % (abs(a) + b);
}