#include <graphics.h>
#include <stdio.h>
#include <conio.h>
#include <math.h>

#define PATHTODRIVER "D:\\TC\\BGI\\"

long double f1(long double x)
{
int i; int n;
long double temp;
long double f;
const k=100;
temp=(long double)x/1;
f=(long double)x/1;
n=1;
   for (i=1; i<k; i++)
	 {
	 temp=(-1)*(temp*((x*x)/((n+1)*(n+2))));
	 n=n+2;
	 f += temp;
	 }
   return(f);
}

void grafik(float x1, float x2)
{
  float y1,y2;
  float x,y;
  float dx=0.0001;
  int l;
  int b;
  int w,h;
  float mx,my;
  int x0,y0;

	    if ((x1<x2) & (x1>=0))
	   {x0=0; l=50; b=480; w=700; h=478;}

	else if ((x1<x2) & (x1<0))
	   {x0=100; l=50; b=480; w=1800; h=478;}

  y1 = f1(x1);
  y2 = f1(x2);
  x  = x1+dx;
  do {
      y=f1(x);
      if (y<y1) y1=y;
      if (y>y2) y2=y;
      x+=dx;
     } while (x<=x2);

  my = h/fabs(y2-y1);
  mx = w/fabs(x2-x1);
  y0=b-abs(y1*my);

  x=x1;
  do {y=f1(x);
  putpixel(x0+x*mx,y0-y*my,15);
  x+=dx;
     } while (x<=x2);
  }


  void main(void)
  {float x1,x2;
   int gdriver = DETECT;
   int gmode;
   int errorcode;

   initgraph(&gdriver,&gmode,PATHTODRIVER);
   errorcode = graphresult();

  printf("Enter x1 (diapozon x1 OT -40 DO +41): ");
  scanf("%f",&x1);
  printf("Enter x2 (diapozon x2 OT -40 DO +41): ");
  scanf("%f",&x2);
  cleardevice();

   if (errorcode == grOk)
   {
    grafik(x1,x2);
    getch();
    closegraph();
   }
   else {
	 printf("Error: %d\n",errorcode);
	 getch();
	}
    }