经典C++程序6

settextstyle(DEFAULT_FONT,HORIZ_DIR,2);
outtextxy(150,40,"How beautiful it is!");
line(130,60,480,60);
setcolor(2);
circle(269,269,137);
}
【程序59】
题目：画图，综合例子。
1.程序分析：
2.程序源代码：
# define PAI 3.1415926
# define B 0.809
# include "graphics.h"
#include "math.h"
main()
{
int i,j,k,x0,y0,x,y,driver,mode;
float a;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
x0=150;y0=100;
circle(x0,y0,10);
circle(x0,y0,20);
circle(x0,y0,50);
for(i=0;i<16;i++)
{
　a=(2*PAI/16)*i;
　x=ceil(x0+48*cos(A));
　y=ceil(y0+48*sin(A)*B);
　setcolor(2); line(x0,y0,x,y);}

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