帮忙看看这个编译错误

[aibo54]

Compiler Error C2724
'identifier' : 'static' should not be used on member functions defined at file scope

A static member function was defined at file scope. Static member functions should be declared with external linkage.

This is a warning when Microsoft extensions are used (/Ze) and is an error when Microsoft extensions are disabled (/Za).

The following is an example of this error:

class C
{
static void func();
};

static void C::func(){}; // error

[savior00]

是不是你静态函数声明错误了。

[aibo54]

没人帮助吗？我可是第一次发贴啊。呜呜

[yxq123]

你最好看一看变量的特性，可能与这个有关。
我也不知道怎么解决。

[aibo54]

class C
{
static void func();
};

static void C::func(){};
他这个为啥有问题？
怎么解决他这个问题？

[aibo54]

an error when Microsoft extensions are disabled (/Za).
真不能懂这句话？

[aibo54]

还是感谢yxq123(笨鸟先飞) ，savior00(VC不是这样用地！！)

[savior00]

去掉后面的static void C::func(){};

[aibo54]

干脆!
-----------------------------------------------------------------------------------
savings.h
-----------------------------------------------------------------------------------
#ifndef savings
#define savings
class Savings
{
public:
Savings(unsigned accNo,float balan = 0.0);
int AccountNo();
float AcntBalan();
static Savings * First();
Savings * Next();
static int NoAccounts();
void Display();
void Deposit(float amount);
void Withdrawal(float amount);
protected:
static Savings * pFirst;
Savings * pNext;
static int count;
unsigned acntNumber;
float balance;
};
#endif
-----------------------------------------------------------------------------------
saving.cpp
-----------------------------------------------------------------------------------
#include <iostream.h>
#include "savings.h"

Savings * Savings::pFirst = 0;
int Savings::count = 0;

Savings::Savings(unsigned accNo,float balan)
{
acntNumber = accNo;
balance = balan;

count++;
if(pFirst==0)
pFirst=this;
else
{
for(Savings * pS=pFirst;pS->pNext;pS=pS->pNext);
pS->pNext=this;
}
pNext=0;
}
int Savings::AccountNo()
{
return acntNumber;
}
float Savings::AcntBalan()
{
return balance;
}
static Savings * Savings::First()
{
return pFirst;
}
Savings * Savings::Next()
{
return pNext;
}
static Savings::NoAccounts()
{
return count;
}
void Savings::Display()
{
cout<<"Saving account number:"<<acntNumber<<"="<<balance<<endl;
}
void Savings::Deposit(float amount)
{
balance+=amount;
}

void Savings::Withdrawal(float amount)
{
if(balance<amount)
cout<<"Insufficient funds:balance"<<balance
<<",withdrawal"<<amount<<endl;
else
balance-=amount;
}

这是钱能的C++程序设计教程p364的一个例子。拜托了！

[aibo54]

谢谢大家，可能是在.cpp文件中，去掉static
static Savings::NoAccounts()
{
return count;
}
变成
Savings::NoAccounts()
{
return count;
}
就不报错了。

[aibo54]

A static member function was defined at file scope. Static member functions should be declared with external linkage.

static member function 被定义在文件域，因该声明在.h文件里。
可能编译器认为：
static Savings::NoAccounts()
{
return count;
}
这的第一句是在声明，可能，可能.....感谢大家！

[jjkezl]

class C
{
void func();
};

void C::func(){};

[aibo54]

终于明白了：
class C
{
static void func();
};

void C::func(){};

或直接
class C
{
static void func(){};
};
这样就对了！问题出在对static成员函数不够理解！