#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#define PI 3.14159265
#define PP(a) (PI*a/180)
void main()
{
  int i,box1,box2,box3,box4,k,Direction;
  float x,y;
  box1=box2=box3=box4=0;
  srand((unsigned)time(NULL));
  for(i=1;i<=10000;i++)
  {  x=y=0.0;
     k=0;
     while(k++<500)
      {
        Direction=rand()%16;
        if(y>=50)   Direction+=8;
        if(y<=-50)  Direction-=8;
        if(x>=60)   Direction+=8;
        if(x<=-60)  Direction-=8;
        switch(Direction)
          {
           case 0:  x+=1;break;
           case 1:  y+=sin(PP(30));x+=cos(PP(30));break;
           case 2:  y+=sin(PP(45));x+=cos(PP(45));break;
           case 3:  y+=sin(PP(60));x+=cos(PP(60));break;
           case 4:  y+=1;break;
           case 5:  x-=sin(PP(30));y+=cos(PP(30));break;
           case 6:  x-=sin(PP(45));y+=cos(PP(45));break;
           case 7:  x-=sin(PP(60));y+=cos(PP(30));break;
           case 8:  x-=1;break;
           case 9:  y-=sin(PP(30));x-=cos(PP(30));break;
           case 10: y-=sin(PP(45));x-=cos(PP(45));break;
           case 11: y-=sin(PP(60));x-=cos(PP(60));break;
           case 12: y-=1;break;
           case 13: x+=sin(PP(30));y-=cos(PP(30));break;
           case 14: x+=sin(PP(45));y-=cos(PP(45));break;
           case 15: x+=sin(PP(60));y-=cos(PP(60));break;
        }
      if((fabs(x-40)+fabs(y-40))<=1)  { box1++;break;}
      if((fabs(x-20)+fabs(y+20))<=1)  { box2++;break;}
      if((fabs(x+45)+fabs(y-50))<=1)  { box3++;break;}
      if((fabs(x+30)+fabs(y-42))<=1)  { box3++;break;}
      }
  }
  printf("%d %d %d  %d",box1,box2,box3,box4);
  getch();
}
附件里面的那个编程题目是这个题和图解；

程序写错了。所以大家的思路都被我带错了地方。