好东西哦

#include<math.h>


int main()
{
 float m,dx,dy,x,y,x_n,y_n,Cx,Cy;
 int n,i,j,L=4;

 int gdriver=DETECT,gmode; 

initgraph(&gdriver,&gmode,""); /*初始化图形系统*/
 setbkcolor(1);
 dx=3.0/639;
 dy=2.2/479;
 for(i=0;i<639;i++)
  {
   Cx=-1.9+i*dx;
   for(j=0;j<479;j++)
     {
      Cy=-1.2+j*dy;
      x=y=0;
      for(n=0;n<=1000;n++)
        {
  x_n=x*x-y*y+Cx;
  y_n=2*x*y+Cy;
  m=x_n*x_n;
  if(m>L) break;
  x=x_n;
  y=y_n;
        }
     putpixel(i,j,(int)(0.4*m)%16);
     }
  }
getch();
closegraph();
}