随机游走问题。程序有错误。 - C语言论坛

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随机游走问题。程序有错误。

#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；

作业.rar (127.97 KB)

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第 2 楼

得分:50

程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#define PI 3.14159265
#define PP(a) (PI*a/180)
int 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()%360;

        x += sin(PP(Direction));
        y += cos(PP(Direction));

        if(y>=50)   y--;
        if(y<=-50)  y++;
        if(x>=60)   x--;
        if(x<=-60)  x++;

        if(sqrt((x-40)*(x-40)+(y-40)*(y-40))<=1)  { box1++;break;}
        if(sqrt((x-20)*(x-20)+(y+20)*(y+20))<=1)  { box2++;break;}
        if(sqrt((x+45)*(x+45)+(y-50)*(y-50))<=1)  { box3++;break;}
        if(sqrt((x+30)*(x+30)+(y-42)*(y-42))<=1)  { box4++;break;}

      }
  }
  printf("%d %d %d  %d",box1,box2,box3,box4);
  getchar();
}

不直到符合你的要求不

收到的鲜花

日的起烟烟于 2010-04-20 13:34 送鲜花 2朵附言：贴代码就是要这样··

人生就像茶几　上面放着许多杯具

人生也像厨房　里面总有一些洗具

第 3 楼

得分:0

顶起

第 4 楼

得分:40

ls代码粒子反弹那块处理的有点儿问题
其他应该没啥大问题了

程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#define PI 3.14159265
// 宏定义的参数最好用括号括起来，虽然本程序里没括号也没影响
#define PP(a) (PI*(a)/180)
int main()
{
  int i,box1,box2,box3,box4,k,Direction;
  double x,y;    //推荐使用double
  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()%360;
        x += sin(PP(Direction));
        y += cos(PP(Direction));
        if(y>=50)   y=100-y;    // 假设粒子做镜面反弹
        if(y<=-50)  y=-100-y;  
        if(x>=60)   x=120-x;   
        if(x<=-60)  x=-120-x;   

        if(sqrt((x-40)*(x-40)+(y-40)*(y-40))<=1)  { box1++;break;}
        if(sqrt((x-20)*(x-20)+(y+20)*(y+20))<=1)  { box2++;break;}
        if(sqrt((x+45)*(x+45)+(y-50)*(y-50))<=1)  { box3++;break;}
        if(sqrt((x+30)*(x+30)+(y-42)*(y-42))<=1)  { box4++;break;}

      }
  }
  printf("%d %d %d  %d",box1,box2,box3,box4);
  getchar();
  return 0;
}