以下三个都是很简单的C语言图形学的小程序，可以输出几个不错的图形，作为子函数还可以的，拿出来展览一下，不过运行的时候注意一下initgraph的路径，自己改一下吧。

#include<graphics.h>  /*A simplest C graph product,run it directly*/

main()
{int x,driver=DETECT,mode;
 registerbgidriver(EGAVGA_driver);
 initgraph(&driver,&mode,"");
 cleardevice();
 setbkcolor(9);
 for(x=170;x<=470;x=x+30)
 {line(170,200,x,100);
  line(170,200,x,300);
  line(470,200,x,100);
  line(470,200,x,300);
 }
 getch();
 closegraph();
}

----------------------------------------------------------------------

#include<graphics.h>  /*Input a number less than 50 and than Enter*/
#include<conio.h>
#include<math.h>

#define pi 3.1415926
#define max 50

main()
{int i,j,n,driver=DETECT,mode;
 double r=100.0,theta,x[max],y[max];
 printf("n(<=50)=");
 scanf("%d",&n);
 registerbgidriver(EGAVGA_driver);
 initgraph(&driver,&mode,"");
 theta=2*pi/n;
 for(i=0;i<n;i++)
 {x[i]=320.0+2*r*cos(theta*i);
  y[i]=200.0-r*sin(theta*i);
 }
 for(i=0;i<n-1;i++)
 {for(j=i+1;j<n;j++)
  {line((int)x[i],(int)y[i],(int)x[j],(int)y[j]);
  }
 }
 getch();
 closegraph();
}

-----------------------------------------------------------------------------

#include<graphics.h>  /*A solid circle filled with 15 colors*/

main()
{int driver=DETECT,mode,i;
 int start=0,end=24;
 registerbgidriver(EGAVGA_driver);
 initgraph(&driver,&mode,"");
 for(i=0;i<15;i++)
 {setfillstyle(1,i+1);
  pieslice(320,200,start,end,100);
  start=start+24;
  end=end+24;
 }
 getch();
 closegraph();
}

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