输入输出运算符重载问题
最近写了一个有关运算符重载的程序，最基本的输入和输出。我用的是vc++6.0，以下程序一直都报错。希望好心人指点迷津，感激不尽

#include <iostream>
using namespace std;

class CFraction
{
private:
int nume;  // 分子
int deno;  // 分母
 public:
 CFraction(int nu=0,int de=1):nume(nu),deno(de){}   //构造函数，初始化用
         friend ostream& operation<<(ostream &out,const CFraction &cf);
         friend istream& operation>>(istream &in,CFraction &cf);
};


ostream& operator<<(ostream &out,const CFraction &cf)
{
out << cf.nume << '/' << cf.deno;
return out;
}

istream& operator>>(istream &in,CFraction &cf)
{
char ch;
while(1)
{
in >> cf.nume >> ch >> cf.deno;
if(cf.deno == 0)
cerr << "分母为0请重新输入\n";
else if(ch != '/')
cerr << "格式错误（形如m/n）请重新输入\n";
else break;
}
return in;
}

int main()
{
CFraction cf1;
CFraction cf2;
cin >> cf1 >> cf2;
cout << cf1 << cf2 << endl;
        
        return 0;
}

[解决办法]
操作符重载，应改为如下：

friend ostream& operator<<(ostream &out,const CFraction &cf);          
friend istream& operator>>(istream &in,CFraction &cf);