完善下面的代码class Date { int Year, Month, Day; public: Date(int y = 2000, int m = 1, int d = 1)//A，带参数，且所有参数都有默认值 friend ostream& operator<<(ostream & out, Date & d) //插入运算符重载 void SetData(int y, int m, int d) //设置数据信息 }; class Person { char* Name; // 姓名，注意：用指针实现 Date Birth; //出生日期 public: Person(const char* namep = 0, int y = 0, int m = 0, int d = 0) // 构造函数,注意成员对象初始化 virtual~Person() // 因为在构造函数中动态申请了空间，则在析构函数中，需释放空间 void show(ostream& out) //显式信息，注意形参是输出流对象 void SetData(const char* namep , int y , int m , int d) //设置数据信息 }; class Student:public Person { float math; //数学成绩 float eng; //英语成绩 public: Student(const char* namep=0, int y = 0, int m = 0, int d = 0,float math = 0, float eng = 0) // 构造函数，注意基类成员初始化 friend ostream& operator<<(ostream& out, Student & s) //插入运算符重载 void SetData(const char* namep, int y, int m, int d, float math, float eng) //设置数据信息 }; int main() { Student * ps = new Student[N]; ps[0].SetData("张三", 2002, 1, 2, 89, 79); ps[1].SetData("李四", 2002, 12, 21, 67, 78); ps[2].SetData("王五", 2003, 10, 12, 87, 95); ofstream of("out.txt"); for (int i = 0; i < N; i++) { of << ps[i] << endl; //输出到文件 cout << ps[i] << endl; //输出到屏幕 } return 0; } 参考输出 Name:张三 Birth:2002.1.2 Math：89 English：79 Name:李四 Birth:2002.12.21 Math：67 English：78 Name:王五 Birth:2003.10.12 Math：87 English：95

完善的代码如下：

#include<iostream>
#include<fstream>
using namespace std;

const int N = 3;

class Date {
    int Year, Month, Day;
public:
    Date(int y = 2000, int m = 1, int d = 1) : Year(y), Month(m), Day(d) {} //A，带参数，且所有参数都有默认值
    friend ostream& operator<<(ostream& out, Date& d); //插入运算符重载
    void SetData(int y, int m, int d) { Year = y; Month = m; Day = d; } //设置数据信息
};

class Person {
    char* Name; // 姓名，注意：用指针实现
    Date Birth; //出生日期
public:
    Person(const char* namep = 0, int y = 0, int m = 0, int d = 0) : Birth(y, m, d) // 构造函数,注意成员对象初始化
    {
        if (namep) {
            Name = new char[strlen(namep) + 1];
            strcpy_s(Name, strlen(namep) + 1, namep);
        }
        else {
            Name = new char[1];
            Name[0] = '\0';
        }
    }

    virtual ~Person() { delete[] Name; } // 因为在构造函数中动态申请了空间，则在析构函数中，需释放空间

    void show(ostream& out) //显式信息，注意形参是输出流对象
    {
        out << "Name:" << Name << " Birth:" << Birth;
    }
    void SetData(const char* namep, int y, int m, int d) //设置数据信息
    {
        if (Name) delete[] Name;
        Name = new char[strlen(namep) + 1];
        strcpy_s(Name, strlen(namep) + 1, namep);
        Birth.SetData(y, m, d);
    }
};

class Student :public Person {
    float math; //数学成绩
    float eng; //英语成绩
public:
    Student(const char* namep = 0, int y = 0, int m = 0, int d = 0, float math = 0, float eng = 0) : Person(namep, y, m, d), math(math), eng(eng) {} // 构造函数，注意基类成员初始化
    friend ostream& operator<<(ostream& out, Student& s); //插入运算符重载
    void SetData(const char* namep, int y, int m, int d, float math, float eng) //设置数据信息
    {
        Person::SetData(namep, y, m, d);
        this->math = math;
        this->eng = eng;
    }
};

ostream& operator<<(ostream& out, Date& d)
{
    out << d.Year << "." << d.Month << "." << d.Day;
    return out;
}

ostream& operator<<(ostream& out, Student& s)
{
    s.show(out);
    out << " Math:" << s.math << "  English:" << s.eng;
    return out;
}

int main() {
    Student* ps = new Student[N];
    ps[0].SetData("张三", 2002, 1, 2, 89, 79);
    ps[1].SetData("李四", 2002, 12, 21, 67, 78);
    ps[2].SetData("王五", 2003, 10, 12, 87, 95);
    ofstream of("out.txt");
    for (int i = 0; i < N; i++)
    {
        of << ps[i] << endl; //输出到文件
        cout << ps[i] << endl; //输出到屏幕
    }
    delete[] ps;
    return 0;
}

输出结果为：

Name:张三 Birth:2002.1.2 Math:89  English:79
Name:李四 Birth:2002.12.21 Math:67  English:78
Name:王五 Birth:2003.10.12 Math:87  English:95

注意，为了避免内存泄漏，我们需要在析构函数中释放动态分配的内存，同时还需要在 SetData 函数中释放旧的 Name 内存并重新分配内存。此外，我们还需要重载 Date 的插入运算符，以便在输出 Student 对象时可以正常输出 Birth 成员。