我在VC6.0下编写程序如下：
#include
using namespace std;
class complex
{
public:
complex(){real=0;imag=0;}
complex(double r,double i){real=r;imag=i;}
complex operator + (complex &c2);
friend ostream & operator <<(ostream &,complex &);
private:
double real;
double imag;
};
complex complex::operator +(complex &c2)
{return complex(real+c2.real,imag+c2.imag);}
ostream & operator <<(ostream &output,complex &c)
{
output<<"("<<c.real<<"+"<<c.imag<<"i)"<<endl;
return output;
}
int main()
{
complex c1(2,4),c2(6,10),c3;
c3=c1+c2;
cout<<c3;
return 0;
}
编译结果如下：
error C2248: 'real' : cannot access private member declared in class 'complex'
error C2248: 'imag' : cannot access private member declared in class 'complex'
error C2593: 'operator <<' is ambiguous
请教高手这是怎么回事。。 后来我把头文件变为 然后去掉using namespace std 却可以， 真奇怪
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