关于C 友元函数重载问题，下面是我写的程序，可在VC6.0显示错误。

显示全部楼层 · 2011-7-7 07:39:31

#includeiostream
usingnamespacestd;
classcomplex
{
protected:
doublereal;
doubleimage;
public:
complex(doubler=0,doublei=0):real(r),image(i){}
voidset(doubler,doublei){real=r;image=i;}
doubleGetreal(){returnreal;}
doubleGetimage(){returnimage;}
friendistream(istream
friendostream(ostream

};
istream(istream\"输入实部：\"endl;
inz.real;
cout\"输入虚部：\"endl;
inz.image;

returnin;
}

ostream(ostreamz.real\"\"z.image\"i\"endl;

returnout;
}

intmain()
{
complext1;
complext2;

cint1;
cint2;
coutt1;
coutt2;

return0;
}
/*errorC2248:\'real\':cannotaccessprotectedmemberdeclaredinclass\'complex\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(6):seedeclarationof\'real\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(23):errorC2248:\'image\':cannotaccessprotectedmemberdeclaredinclass\'complex\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(7):seedeclarationof\'image\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(31):errorC2248:\'real\':cannotaccessprotectedmemberdeclaredinclass\'complex\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(6):seedeclarationof\'real\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(31):errorC2248:\'image\':cannotaccessprotectedmemberdeclaredinclass\'complex\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(7):seedeclarationof\'image\'
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(41):errorC2593:\'operator\'isambiguous
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(42):errorC2593:\'operator\'isambiguous
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(43):errorC2593:\'operator\'isambiguous
C:\\DocumentsandSettings\\Owner\\MyDocuments\\Text1.cpp(44):errorC2593:\'operator\'isambiguous
Errorexecutingcl.exe.*/
//求高手帮我看看，做很久了，不知道为什么？

千问 · 2011-7-7 07:39:31

#includeiostream
usingnamespacestd;

classcomplex{
protected:
doublereal;
doubleimage;
public:
complex(doubler=0,doublei=0):real(r),image(i){}
voidset(doubler,doublei){real=r;image=i;}
doubleGetreal(){returnreal;}
doubleGetimage(){returnimage;}
friendistream(istream
friendostream(ostream
};

istream(istream\"输入实部：\"endl;
inz.real;
cout\"输入虚部：\"endl;
inz.image;
returnin;
}

ostream(ostreamz.real\"\"z.image\"i\"endl;
returnout;
}

intmain()
{
complext1;
complext2;
cint1;
cint2;
coutt1;
coutt2;
return0;
}

试一下，protect的问题不知道是不是VC的问题，VS下运行没有问题，你的operator定义友元函数时不要在操作符前加空格

我这个程序也不能运行吗？应该不会吧。。。