#include <iostream> #include <string> using namespace std; class Date { public: int year,month,day; Date(int year=2000,int month=1,int day=1):year(year),month(month),day(day) {} void print() { cout<<year<<","<<month<<","<<day; } }; class person { public: string Name; string Num; Date brith; person(string Name="张三", string Num="123456789", int year=2000,int month=1,int day=1): Name(Name),Num(Num),brith(year,month,day) {} string GetName() { return Name; } string GetNum() { return Num; } Date Getbrith() { return brith; } }; class student: private person { private: int StNum; }; class teacher:public person { private: Date Time; }; class CTA :public student,public teacher { private: int No; }; int main() { person p1("张三","123456789",2000,1,1); person p2("李四","123456789",2001,1,1); cout<<"序号"<<endl; cout<<" 1 "<<endl; cout<<" "<<p1.GetName()<<endl; cout<<" "<<p1.GetNum()<<endl; cout<<" "<<p1.Getbrith()<<endl; cout<<" 2 "<<endl; cout<<" "<<p2.GetName()<<endl; cout<<" "<<p2.GetNum()<<endl; cout<<" "<<p2.Getbrith()<<endl; }error: no match for 'operator' and 'Date') cout怎么解决

在输出日期时，cout不知道如何输出Date类型的数据，因此需要重载<<运算符。在Date类中添加如下代码即可：

friend ostream& operator<<(ostream& os, const Date& date) {
    os << date.year << "-" << date.month << "-" << date.day;
    return os;
}

然后在输出日期时，使用cout << p1.Getbrith()代替cout << p1.Getbrith()。

相关问题

#include <iostream> using namespace std; class Date { public: int year,month,day; Date(int year=2000,int month=1,int day=1):year(year),month(month),day(day) {} }; class Cperson { private: string Name; string Num; Date brith; Cperson(const char *pName="张三", string Num="123456789123456789", int year=2000,int month=1,int day=1): Name(Name),Num(Num),brith(year,month,day) {} string GetName() { return Name; } string GetNum() { return Num; } int Getbrith() { return brith; } }; cass Cstudent: private Cperson { private: int StNum; }; class Cteacher:public Cperson { private: Date Time; }; int main() { cout << "手机编程APP"; return 0; }有什么错误

在类Cperson的构造函数中，初始化成员变量时，应该使用初始化列表中的参数，而不是使用类内部定义的变量。正确的构造函数应该是：

Cperson(const char *pName="张三",
        string Num="123456789123456789",
        int year=2000,int month=1,int day=1):
    Name(pName),Num(Num),brith(year,month,day)
{}

此外，在类Cperson的成员函数Getbrith中，返回值应该是一个Date对象，而不是int类型。应该改为：

Date Getbrith()
{
    return brith;
}

最后，在类Cstudent和Cteacher中，应该声明访问权限为public，否则外部无法访问这些类的成员。修正后的代码如下：

#include <iostream>
using namespace std;

class Date {
public:
    int year,month,day;
    Date(int year=2000,int month=1,int day=1):year(year),month(month),day(day)
    {}
};

class Cperson {
public:
    string Name;
    string Num;
    Date brith;
    Cperson(const char *pName="张三",
            string Num="123456789123456789",
            int year=2000,int month=1,int day=1):
        Name(pName),Num(Num),brith(year,month,day)
    {}
    string GetName()
    {
        return Name;
    }
    string GetNum()
    {
        return Num;
    }
    Date Getbrith()
    {
        return brith;
    }
};

class Cstudent: public Cperson {
public:
    int StNum;
};

class Cteacher:public Cperson {
private:
    Date Time;
public:
    // 省略构造函数
};

int main() {
    cout << "手机编程APP";
    return 0;
}

#include<iostream>#include<string>using namespace std;class Book;class Date{ private: int year; int month; int day; public: Date(int year_, int month_, int day_); Date(Date &q); friend class Book;};class Book{ private: string name; string author; string isbn; double price; Date date; public: Book(string name_, string author_, string isbn_, Date date_, double price_); Book(Book &p); void printInfo(); };Date::Date(int year_, int month_, int day_):year(year_),month(month_),day(day_){}Date::Date(Date &q){ year=q.year; month=q.month; day=q.day;}Book::Book(string name_, string author_, string isbn_, Date date_, double price_):name(name_),author(author_),isbn(isbn_),date(date_),price(price_){ }Book::Book(Book &p){ name=p.name; author=p.author; isbn=p.isbn; price=p.price; date=p.date;}void Book::printInfo(){ cout<<name<<" "<<author<<" "<<isbn<<" "<<price<<endl; cout<<date.year<<"/"<<date.month<<"/"<<date.day<<endl;}int main(){ int year,month,day; string name,author,isbn; double price; cin>>year>>month>>day; Date date(year,month,day); cin>>name>>author>>isbn>>price; Book b(name,author,isbn,date,price); b.printInfo(); return 0;}这个代码为什么有[错误] no matching 函数 对于 call 到 'Date::Date()'。

你的代码没有问题，可能是你的编译器版本较老，无法识别 C++11 的构造函数语法。你可以尝试将 `Date` 的构造函数改为传统的形式：

Date::Date(int year_, int month_, int day_)
{
    year = year_;
    month = month_;
    day = day_;
}

Date::Date(const Date& q)
{
    year = q.year;
    month = q.month;
    day = q.day;
}

或者在编译时添加 `-std=c++11` 参数启用 C++11 支持。