C++友元函数问题 - C++教室 - C++论坛

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C++友元函数问题

请各位大侠帮忙看一下这个程序的友元使用错在哪：
#include<iostream>
using namespace std;

class Gbank{

private:
        double balance;
public:
     double acount(double k)
     {
        balance=k;
    }
friend void total(Cbank a,Bbank b,Gbank c);

};

class Bbank{

private:
    double balance;
public:
      double acount(double j)
     {
        balance=j;
     }
friend void total(Cbank a,Bbank b,Gbank c);

};

class Cbank{

private:
    double balance;
public:

     double acount(double i)
     {
        balance=i;
     }

friend void total(Cbank a,Bbank b,Gbank c);
};

double m=0;

void total(Cbank a,Bbank b,Gbank c)
{

   m=a.balance+b.balance+c.balance;
    cout<<"总存款为："<<m<<endl;
}

void main()
{
Cbank a;
Bbank b;
Gbank c;
double i,j,k;
cout<<"请分别输入三个银行的存款:";
while(1)
{
cin>>i>>j>>k;
   a.acount(i);
   b.acount(j);
   c.acount(k);
   total(Cbank a,Bbank b,Gbank c);

}
}

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#include<iostream> using namespace std; class Cbank ; // 要声明 class Bbank; class Gbank{ private: double balance; public: void acount(double k) { balance=k; } friend void total(Cbank a,Bbank b,Gbank c); // 要提前声明 }; class Bbank{ private: double balance; public: void acount(double j) // { balance=j; } friend void total(Cbank a,Bbank b,Gbank c); }; class Cbank{ private: double balance; public: void acount(double i) { balance=i; } friend void total(Cbank a,Bbank b,Gbank c); }; double m=0; void total(Cbank a,Bbank b,Gbank c) { m=a.balance+b.balance+c.balance; cout<<"总存款为："<<m<<endl; } void main() { Cbank a; Bbank b; Gbank c; double i,j,k; cout<<"请分别输入三个银行的存款:"; while(1) { cin>>i>>j>>k; a.acount(i); b.acount(j); c.acount(k); total(a,b,c); } }