最近的點執行

-1

我想實現一個最近點的程序。下面是代碼：最近的點執行

#include <iostream> 
#include <cstdlib> 
#include <math.h> 
using namespace std; 

float randfloat(){ 
    return 1.0*rand()/RAND_MAX; 
} 

class point 
{ 
    public : 
    float x,y; 

    float distance(point& a){ 
     float dx=x-a.x; 
     float dy=y-a.y; 
     return sqrt(dx*dx+dy*dy); 
    } 
}; 

int main(int argc,char* argv[]){ 
    int i,cnt=0; 
    int n=atoi(argv[1]); 
    float d=atof(argv[2]); 
    point *a=new point[n]; 
    for (int i=0;i<n;i++) 
    { 
     a[i].x=randfloat(); 
     a[i].y=randfloat(); 
    } 
    for (i=0;i<n;i++) 
     for (int j=i+1;j<n;j++) 
      if ((distance(a[i],a[j])<d)) cnt++; 
    cout << cnt << "pairs within" << d << endl; 

    return 0; 
}

但是，當我在命令行編譯它給出這樣的錯誤：

指針不在基類點的構件

這裏是完整列表：

C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(373) : error C 
2039: 'iterator_category' : is not a member of 'point' 
     closet_point.cpp(9) : see declaration of 'point' 
     closet_point.cpp(37) : see reference to class template instantiation 'st 
d::iterator_traits<_Iter>' being compiled 
     with 
     [ 
      _Iter=point 
     ] 
C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(373) : error C 
2146: syntax error : missing ';' before identifier 'iterator_category' 
C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(373) : error C 
4430: missing type specifier - int assumed. Note: C++ does not support default-i 
nt 
C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(373) : error C 
2602: 'std::iterator_traits<_Iter>::iterator_category' is not a member of a base 
class of 'std::iterator_traits<_Iter>' 
     with 
     [ 
      _Iter=point 
     ]

我該如何解決這個問題？

來源

2010-08-24 dato datuashvili

對不起，但你確實知道衣櫥是什麼，對吧？有趣的是，你甚至可以在cpp文件中輸入錯字:)你可能想糾正這個問題。除此之外，我認爲代替距離（a [i]，a [j]）它應該是[i] .distance（a [j]） – humbagumba 2010-08-24 08:23:20