题目是：定义日期类和学生类，日期类的数据成员为年、月、日。从键盘输入学生的学号、姓名、性别、出生日期以及3门课程的成绩，保存到学
生类数组中，计算总分、均分，将成绩按总分由高到低排序，输出学生成绩情况。


#include <iostream>
using namespace std;
class date
{
private:
    int year;
    int month;
    int day;
public:
    date();//默认值:1900/01/01
    date(int yy,int mm,int dd);//有参构造，定义对象的同时实现对象的初始化
    date(date &d);
    void input();
    void print();
};
date::date()
{
    year=1900;
    month=01;
    day=01;
}
date::date(int yy,int mm,int dd)
{
    year=yy;
    month=mm;
    day=dd;
}
date::date(date &d)
{
    year=d.year;
    month=d.month;
    day=d.day;
}
void date::input()
{
    cout<<"出生日期"<<endl;
    cout<<"年:";cin>>this->year;
    cout<<"月:";cin>>this->month;
    cout<<"日;";cin>>this->day;
}
void date::print()
{
    cout<<year<<"-"<<month<<"-"<<day<<" ";
}
class student
{
private:
    char m_num[4];
    char m_name[9];
    date m_birthday;//出生日期   含有对象成员
    float kc[5];
public:
    student();
    student(char num[],char name[],int kc[3],int yy,int mm,int dd);//有参构造函数
    student(const student &s);
    void input();
    void print();
};
student::student():m_birthday()
{
    strcpy(m_num,"000");
    strcpy(m_name,"noname");
    kc[0]=90;
    kc[1]=90;
    kc[2]=90;
}
student::student(char num[],char name[],int kc[3],int yy,int mm,int dd):m_birthday(yy,mm,dd)
{
    int a,b,c;
    strcpy(m_num,num);
    strcpy(m_name,name);
    kc[0]=a;
    kc[1]=b;
    kc[2]=c;
}
student::student(const student &s)
{
    strcpy(m_num,s.m_num);
    strcpy(m_name,s.m_name);
    m_birthday=s.m_birthday;
    kc[0]=s.kc[0];
    kc[1]=s.kc[1];
    kc[2]=s.kc[2];
}
void student::input()
{
    cout<<"学号：";
    cin>>this->m_num;
    cout<<"姓名：";
    cin>>this->m_name;
    cout<<"语文:";
    cin>>kc[0];
    cout<<"数学:";
    cin>>kc[1];
    cout<<"英语:";
    cin>>kc[2];
    m_birthday.input();
}
void student::print()
{
    cout<<"学号:"<<this->m_num<<"  "<<"姓名:"<<this->m_name<<"  "<<endl;
    cout<<"语文:"<<kc[0]<<"  "<<"数学:"<<kc[1]<<"  "<<"英语:"<<kc[2]<<endl;
    m_birthday.print();
}
void main()
{
    student s;//定义一个学生对象，取默认值
    student s2;//定义学生对象s2，取默认值
    student s3("003","Tom",90,90,88,2000,11,14);
    student s4(s3);
    s2.input();//输入信息
    s.print();//输出学生信息
    s2.print();//输出信息
    s3.print();
    s4.print();
}

    1、student s3("003","Tom",90,90,88,2000,11,14);
    2、   student(char num[],char name[],int kc[3],int yy,int mm,int dd);//有参构造函数
楼主比较上面两句就知道了。
然后将  void  main( )改为int  main( ),并在main函数最后加上 return  0;

date::date(date &d)
{
    year=d.year;
    month=d.month;
    day=d.day;
}

这个是拷贝构造函数吧？参数是const date& d

你这个代码回头我给敲一遍