如题！本人是菜鸟，敬请各位大虾指教！！！！！

#include <stdio.h>
#include <graphics.h>
#include <dos.h>
typedef struct
{
 void (*Inits)();/*初始化鼠标驱动*/
 int  (*MButton)();/*按键位置与按键状态*/
 void (*MouseIco)();/*画鼠标光标*/
 int  x;/*横向坐标*/
 int  y;/*竖向坐标*/
 float R;
 int  ox;
 int  oy;
 int  button;/*按键标志*/
}MOUSE;/*鼠标类*/
void mInits();
int  mMButton();
void mMouseIco();
union REGS rg;
int main()
{
 MOUSE *pM,mouse;
 float R;
 int graphdrive=0,graphmode=0;
 int tracking=0,x1,y1,ox1,oy1;
 pM=&mouse;
 pM->Inits=mInits;
 pM->MButton=mMButton;
 pM->MouseIco=mMouseIco;
 initgraph(&graphdrive,&graphmode,"");
 setbkcolor(1);
 setwritemode(1);/*画线模式*/
 pM->Inits(&pM->x,&pM->y);
 pM->ox=pM->x;
 pM->oy=pM->y;
 do
 {
  pM->button=pM->MButton(&pM->x,&pM->y);
  pM->MouseIco(&pM->x,&pM->y,&pM->ox,&pM->oy);
  if(pM->button==1)
  {
    if(!tracking)/*捕获开关*/
       {
  ox1=x1=pM->x;
  oy1=y1=pM->y;
  tracking=1;
       }
    if(pM->x!=ox1||pM->y!=oy1)
     {
 R=sqrt((ox1-x1)*(ox1-x1)+(oy1-y1)*(oy1-y1))/2;      
line(x1,y1,ox1,oy1);
      rectangle(x1,y1,ox1,oy1);
   
      circle((x1+ox1)/2,(y1+oy1)/2,R);
      ox1=pM->x;
      oy1=pM->y;
     R=sqrt((pM->x-x1)*(pM->x-x1)+(pM->y-y1)*(pM->y-y1))/2;
      line(x1,y1,pM->x,pM->y);
      rectangle(x1,y1,pM->x,pM->y);
     circle((x1+ox1)/2,(y1+oy1)/2,R);
     }
  }
  else tracking=0;
 }while(pM->button!=3);
}
void mInits(int *mx,int *my)
{
 rg.x.ax=0;
 int86(0x33,&rg,&rg);
 if(rg.x.ax==0)
    exit(1);
 rg.x.ax=7;
 rg.x.cx=2;
 rg.x.dx=640;
 int86(0x33,&rg,&rg);
 rg.x.ax=8;
 rg.x.cx=2;
 rg.x.dx=480;
 int86(0x33,&rg,&rg);
 rg.x.ax=4;
 *mx=rg.x.cx=640/2;
 *my=rg.x.dx=480/2;
 int86(0x33,&rg,&rg);
 rectangle(rg.x.cx-2,rg.x.dx-2,rg.x.cx+2,rg.x.dx+2);
}
int mMButton(int *lx,int *ly)
{
 rg.x.ax=3;
 int86(0x33,&rg,&rg);
 *lx=rg.x.cx;
 *ly=rg.x.dx;
 return rg.x.bx;
}
void mMouseIco(int *x,int *y,int *oldx,int *oldy)
{
 if(*x!=*oldx||*y!=*oldy)
 {
  rectangle(*oldx-2,*oldy-2,*oldx+2,*oldy+2);
  *oldx=*x;
  *oldy=*y;
  rectangle(*x-2,*y-2,*x+2,*y+2);
 }
}


各位帮我看看一下这个程序，，没错误，但运行的时候一闪而过，为什么？？？急啊

#include <math.h>
#include<graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <dos.h>

#include <time.h>

main()

{

int gd,gm,nx,ny,co,Mx,My,i,col[]={1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

float k,x,y,r,q,p,m,kc,xn,yn,mx,my,mxx,myy;

char *sp;

p=.32;

q=.043;

m=100;

printf("\nPlease input the coefficient k(0-300) p(0.32) q(0.043):");

scanf("%f %f %f",&k,&p,&q);

_AX=0x0013;

__int__(0x10);

sp=MK_FP(0xa000,0);

Mx=319;

My=199;

randomize();

co=0xff;

mx=Mx;my=My;

r=0;

mxx=2.4/mx;

myy=2.4/my;

mx=-.93;

my=-1.2;

for(ny=0;ny<=My;ny++)

{

for(nx=0;nx<=Mx;nx++)

{

x=mx+mxx*nx;

y=my+myy*ny;

kc=0;

while(1)

{

xn=x*x-y*y+p;

yn=2*x*y+q;

x=xn;

y=yn;

r=x*x+y*y;

kc++;

if(kc==k)break;

if(r>m)break;

}

i=(k-kc)/3;

if(i>0xff)i=0xff;

sp[nx+ny*320]=i;

}

}

getch();

_AX=0x0003;

__int__(0x10);

}
 
大家能否在帮我看一下这段程序错在那里？？？？？？