#include<math.h>#include<graphics.h>#define PI 3.14159#define D 100main(){ float a,e,x1,y1,x2,y2;int gdriver=VGA,gmode=VGAHI;initgraph(&gdriver,&gmode,"d:\\tc");cleardevice();gotoxy(26,26); printf("感谢使用由第九组成员编写的程序\n"); printf("组长：刘明明\n"); printf("成员：刘刚，申时永，张琴，简孝文\n"); setcolor(GREEN); setbkcolor(0);for(a=0.0;a<2*PI;a+=2*PI/720){  e=D*(1+sin(4*a));  x1=320+e*cos(a);  x2=320+e*cos(a+PI/5);  y1=240+e*sin(a);  y2=240+e*sin(a+PI/5);  line(x1,y1,x2,y2);    }      getch();closegraph();  }

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