亲水相互作用色谱:请大家帮我指出下面程序的错误。

#include"graphics.h"
#include "math.h"
#include "dos.h"
#include "conio.h"
#include "stdlib.h"
#include "stdio.h"
#include "stdarg.h"
#define MAXPTS 15
#define PI 3.1415926
struct PTS {
int x,y;
};
double AspectRatio;
scanf("%7.2f",&AspectRatio);
void LineToDemo(void)
{
struct viewporttype vp;
struct PTS points[MAXPTS];
int i, j, h, w, xcenter, ycenter;
int radius, angle, step;
double rads;
printf(" MoveTo / LineTo Demonstration" );
getviewsettings( &vp );
h = vp.bottom - vp.top;
w = vp.right - vp.left;
xcenter = w / 2;
ycenter = h / 2;
radius = (h - 30) / (AspectRatio * 2);
step = 360 / MAXPTS;
angle = 0;
for( i=0 ; i<MAXPTS ; ++i ){
rads = (double)angle * PI / 180.0;
points[i].x = xcenter + (int)( cos(rads) * radius );
points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio );
angle += step;
}
circle( xcenter, ycenter, radius );
for( i=0 ; i<MAXPTS ; ++i ){
for( j=i ; j<MAXPTS ; ++j ){
moveto(points[i].x, points[i].y);
lineto(points[j].x, points[j].y);
} } }
main()
{int driver,mode;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
LineToDemo();}