nat

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>
#include <conio.h>
struct place
{
    int x;
    int y;
};
void gotoxy(int x, int y)
{
    COORD c;
    c.X = x - 1;
    c.Y = y - 1;
    SetConsoleCursorPosition (GetStdHandle(STD_OUTPUT_HANDLE), c);
}
int main(void)
{
    struct place head, body1, body2, body3, body4, tail;
    head.x=40;
    head.y=12;
    body1.x=39;
    body1.y=12;
    body2.x=38;
    body2.y=12;
    body3.x=37;
    body3.y=12;
    body4.x=36;
    body4.y=12;
    tail.x=35;
    tail.y=12;
    int r,lag=50,dir=1;
    srand(time(NULL));
    printf("tempo de delay: ");
    scanf("%d",&lag);
    system("cls");
    fflush(stdin);
    while(kbhit()==0)
    {
        gotoxy(tail.x,tail.y);
        printf(" ");
        gotoxy(body4.x,body4.y);
        printf("%c",176);
        gotoxy(body3.x,body3.y);
        printf("%c",177);
        gotoxy(body2.x,body2.y);
        printf("%c",177);
        gotoxy(body1.x,body1.y);
        printf("%c",178);
        gotoxy(head.x,head.y);
        printf("%c",178);

        tail=body4;
        body4=body3;
        body3=body2;
        body2=body1;
        body1=head;

        r=rand() %20;
        switch (r)
        {
            case 0: dir++; break;
            case 1: dir--; break;
        }

        if(dir==-1) dir=3;
        if(dir==4) dir=0;

        switch(dir)
        {
            case 0: head.y++; break; //baixo
            case 1: head.x--; break; //esquerda
            case 2: head.y--; break; // cima
            case 3: head.x++; break; //direita
        }
        int q;
        if(head.y==1)
        {
            if(dir==2)
            q=rand() %2;
            if(q==0)
            dir++;
            else
            dir--;
        }
        else
        {
            q=rand() %5;
            if(q==0)
            dir=0;
        }
        if(head.y==25)
        {
            if(dir==0)
            q=rand() %2;
            if(q==0)
            dir++;
            else
            dir--;
        }
        else
        {
            q=rand() %5;
            if(q==0)
            dir=2;
        }
        if(head.x==1)
        {
            if(dir==1)
            q=rand() %2;
            if(q==0)
            dir++;
            else
            dir--;
        }
        else
        {
            q=rand() %5;
            if(q==0)
            dir=3;
        }
        if(head.x==80)
        {
            if(dir==3)
            q=rand() %2;
            if(q==0)
            dir++;
            else
            dir--;
        }
        else
        {
            q=rand() %5;
            if(q==0)
            dir=1;
        }

        _sleep(40);
    }

        return 0;
}