#include <iostream>
#include <cmath>
#include <graphics.h>
using namespace std;
int main()
{
    const float startX = - 3, finishX = 5;
    float x, y, x1, y1, p;

    cout << "vvedite shag: ";
    cin >> p;

    initwindow(800, 400 ) ;
    setfillstyle( 1, 15 );
    line( 0, 200, 800, 200 );
    line( 250, 0, 250, 400 );
    line( 250, 0, 240, 10 );
    line( 250, 0, 260, 10 );
    line( 800, 200, 790, 210 );
    line( 800, 200, 790, 190 );


    outtextxy( 790, 210, "X");
    outtextxy(240, 10, "Y");


    moveto(50,250);
    for(float x=startX; x <= finishX; x+=p)
    {
      if ((x >= -3) and (x <= -2))
      {
        y = - x - 2;
        x1 = 250 + x*50;
        y1 = 200 - y*50;
        setcolor(10);
        circle(x1,y1,3);
        setfillstyle(1,10);
        floodfill(x1,y1,10);
        lineto(x1,y1);
        }
        if ( (x >= -2) && (x <= -1))
        {
          y = sqrt(1 - (x + 1) * (x + 1));
          x1 = 250 + x*50;
          y1 = 200 - y*50;
          setcolor(10);
          circle( x1,y1,3 );
          setfillstyle( 1,10 );
          floodfill(x1,y1,10 );
          arc ( 200 , 200 , 90 , 180 , 50 ) ;
          }
        if ((x >= -1) && (x <= 1))
        {
          y = 1;
          x1 = 250 + x*50;
          y1 = 200 - y*50;
          setcolor(10);
          circle( x1,y1,3 );
          setfillstyle( 1, 10 );
          floodfill(x1,y1,10 );
          lineto( x1,y1 );
          }
          if ((x >= 1) && (x <= 2))
            {
              y = -2*x + 3;
              x1 = 250 + x*50;
              y1 = 200 - y* 50;
              setcolor(10);
              circle( x1,y1,3 );
              setfillstyle( 1, 10 );
              floodfill(x1,y1,10 );
               lineto( x1,y1 );
              }
              if ((x >= 2) && (x <= 5))
            {
              y = - x / x;
              x1 = 250 + x*50;
              y1 = 200 - y* 50;
              setcolor(10);
              circle( x1,y1,3 );
              setfillstyle( 1, 10 );
              floodfill(x1,y1,10 );
              lineto( x1,y1 );
              }
              }


getch();
closegraph();
return 0;

}