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友元函数

书上不是说友元函数可以访问类的私有成员嘛..可是我的程序为什么出错了...denom,numer是类的私有成员
friend ostream & operator << (ostream & out,const Rational & value){
if(value.denom!=0){
out<<value.numer;
if(value.denom!=1){
out<<'/'<<value.denom;
return out;
}

if(value.numer==0)
out<<"indeterminate";
else{
if(value.numer<=0)
out<<'-';
out<<"infinity";
}
return out;
}
}

error C2248: 'denom' : cannot access private member declared in class 'Rational'
e:\programmer\visual c++\rationals\rational.h(20) : see declaration of 'denom'
E:\programmer\Visual C++\Rationals\Rational.cpp(94) : error C2248: 'numer' : cannot access private member declared in class 'Rational'
e:\programmer\visual c++\rationals\rational.h(19) : see declaration of 'numer'
E:\programmer\Visual C++\Rationals\Rational.cpp(95) : error C2248: 'denom' : cannot access private member declared in class 'Rational'
e:\programmer\visual c++\rationals\rational.h(20) : see declaration of 'denom'
E:\programmer\Visual C++\Rationals\Rational.cpp(96) : error C2248: 'denom' : cannot access private member declared in class 'Rational'
e:\programmer\visual c++\rationals\rational.h(20) : see declaration of 'denom'
E:\programmer\Visual C++\Rationals\Rational.cpp(100) : error C2248: 'numer' : cannot access private member declared in class 'Rational'
e:\programmer\visual c++\rationals\rational.h(19) : see declaration of 'numer'
E:\programmer\Visual C++\Rationals\Rational.cpp(103) : error C2248: 'numer' : cannot access private member declared in class 'Rational'
e:\programmer\visual c++\rationals\rational.h(19) : see declaration of 'numer'
Error executing cl.exe.