柳州飞上海航班:求c编程啊

#include "math.h"
#include <graphics.h>
#include <stdlib.h>
#include <time.h>
void main(void)
{
int gdriver=DETECT,gmode;
int ran_number;
float a,b,c,d,e,f;
float x,y,x_pre,y_pre;
float disp_x,disp_y;
initgraph(&gdriver,&gmode,"\\tc");
/* setfillstyle(SOLID_FILL,RED);*/
randomize();
setbkcolor(BLUE);
setcolor(14);
x=y=x_pre=y_pre=0;
ran_number=90;
while(kbhit()==0)
{
ran_number=random(100)+1;
if (ran_number==1)
{
a=0;
b=0;
c=0;
d=0.15;
e=0;
f=0;
}
else if (ran_number>1&&ran_number<=86)
{
a=0.87;
b=0.014;
c=-0.014;
d=0.87;
e=0;
f=1.6;
}
else if (ran_number>86&&ran_number<=93)
{
a=0.26;
b=0.472;
c=0.772;
d=0.34;
e=0;
f=1.6;
}
else
{
a=0.28;
b=0.867;
c=-0.478;
d=0.4;
e=0;
f=0.44;
}
x=a*x_pre*cos(b)-d*sin(c)*y_pre+e;
y=c*x_pre*sin(b)+d*cos(c)*y_pre+f;
x_pre=x;
y_pre=y;
disp_x=(x+5)*639/12;
disp_y=350-y*28;
putpixel((int)disp_x,(int)disp_y,GREEN);
}
getch();
getch();
closegraph();
}