operator重载!!

来源：百度知道 编辑：UC知道 时间：2024/05/31 10:30:01
#include<iostream>
using namespace std;
class stu_age
{
public:
stu_age operator+=(const stu_age&);
public:
friend istream& operator>>(istream&, stu_age&);

stu_age():
year(1980),mouth(1),day(1){}
// stu_age(istream &is){is >> *this;}
void output() {cout<<year<<"year"<<mouth<<"mouth"<<day<<"day"<<'\n';}
private:
int year;
int mouth;
int day;
};
stu_age operator+(const stu_age&,const stu_age&);

inline istream&
operator>>(istream& in,stu_age& s)
{
in >>s.year>>s.mouth>>s.day;
return in;
}

stu_age n;
编译过程中总是显示不能进入private成员??如何改啊??

这是vc6 的问题，要在class里面定义才行：

#include<iostream>
using namespace std;
class stu_age
{
public:
stu_age operator+=(const stu_age&);
public:
friend istream;
friend istream& operator >>(istream& in, stu_age &s)
{
in >> s.year >> s.mouth >> s.day;
return in;
}

stu_age():
year(1980),mouth(1),day(1){}
// stu_age(istream &is){is >> *this;}
void output() {cout<<year<<"year"<<mouth<<"mouth"<<day<<"day"<<'\n';}
private:
int year;
int mouth;
int day;
};
stu_age operator+(const stu_age&,const stu_age&);

stu_age n;

private:
int year;
int mouth;
int day;

这个地方的private改成public就可以了，不过这样不好

因为你的
int year;
int mouth;
int day;
权限是private；所以你不能直接使用成员，如果你想直接使用