#include <iostream>
#include <ctime>
#include <windows.h>
#include <math.h>

using namespace std;

int main()
{
    unsigned int before( time(0) );
    unsigned int t = 0, x = 0, l = 10, p = 0, next = 0;
    unsigned char tab[80*24+1];
    bool dessous = true;
    for(int i = 0;i<80*24;i++)
        tab[i] = ' ';
    tab[80*24] = 0;

    while ( 1 == 1 )
    {
        p = next;
        //next = ((t%l>l/2)?l-t%l:t%l)*((t%l>l/2)?l-t%l:t%l);
        next = sin(t/10.0)*l+l;
        system("cls");
        for ( int i(0); i < 24; i++ )
        {
            if((i>=p && dessous) || (i >= p && i<next && p<next) || (i < p && i>=next && p>next) || (p==next && i==p))
                tab[x+i*80] = '#';
            else
                tab[x+i*80] = ' ';
        }
        cout << tab;
        t++;
        x = (x+1)%80;
        Sleep(100);
    }
    return 0;
}