可以把出现的问题修改一下吗

#include
using namespace std;
class date{
private:
int year;
int month;
int day;
public:
date(int myear,int mmonth,int mday){
year=myear;
month=mmonth;
day=mday;
}
void setyear(int myear){
year=myear;
}
int getyear(){
return year;
}
void deyear(){
cout<<year<<endl;
}
void setmonth(int mmonth){
month=mmonth;
}
int getmonth(){
return month;
}
void demonth(){
cout<<month<<endl;
}
void setday(int mday){
day=mday;
}
int getday(){
return day;
}
void deday(){
cout<<day<<endl;
}

};
class people{
private:
int card;
int phone;
string name;
int done;
date time;
bool result;
public:
void people(int card,int phone,string name,int done,date time,bool result){
}
void setcard(int mcard){
card=mcard;
}
int getcard(){
return card;
}
void decard(){
cout<<card<<endl;
}
void setphone(int mphone){
phone=mphone;
}
int getphone(){
return phone;
}
void dephone(){
cout<<phone<<endl;
}
void setname(int mname){
name=mname;
}
string getname(){
return name;
}
void deneme(){
cout<<name<<endl;
}
void setdone(int mdone){
done=mdone;
}
int getdone(){
return done;
}
void dedone(){
cout<<done<<endl;
}
void settime(date mtime){
time=mtime;
}
date gettime(){
return time;
}
void detime(){
cout<<time<<endl;
}
void setresult(int mresult){
result=mresult;
}
bool getresult(){
return result;
}
void deresult(){
cout<<result<<endl;
}
};
int main(){

return 0;
}

#include <iostream>        //头文件别漏了哦
using namespace std;

class date {
private:
    int year;
    int month;
    int day;

public:
    //添加一个默认构造函数
    date() {
        year = 2022;
        month = 01;
        day = 01;
    }
    date(int myear, int mmonth, int mday) {
        year = myear;
        month = mmonth;
        day = mday;
    }

    void setyear(int myear) {
        year = myear;
    }
    int getyear() {
        return year;
    }
    void deyear() {
        cout << year << endl;
    }

    void setmonth(int mmonth) {
        month = mmonth;
    }
    int getmonth() {
        return month;
    }
    void demonth() {
        cout << month << endl;
    }

    void setday(int mday) {
        day = mday;
    }
    int getday() {
        return day;
    }
    void deday() {
        cout << day << endl;
    }

    //定义一个show函数来输出信息
    void show() {
        cout << this->year << "." << this->month << "." << this->day << endl;
    }
};

class people {
private:
    int card;
    int phone;
    string name;
    int done;
    date time;
    bool result;

public:
    //构造方法不能有返回类型（void、int等）
    people(int card, int phone, string name, int done, date time, bool result) {
        this->card = card;
        this->phone = phone;
        this->name = name;
        this->done = done;
        this->time = time;
        this->result = result;
    }

    void setcard(int mcard) {
        card = mcard;
    }
    int getcard() {
        return card;
    }
    void decard() {
        cout << card << endl;
    }

    void setphone(int mphone) {
        phone = mphone;
    }
    int getphone() {
        return phone;
    }
    void dephone() {
        cout << phone << endl;
    }

    void setname(int mname) {
        name = mname;
    }
    string getname() {
        return name;
    }
    void deneme() {
        cout << name << endl;
    }

    void setdone(int mdone) {
        done = mdone;
    }
    int getdone() {
        return done;
    }
    void dedone() {
        cout << done << endl;
    }

    void settime(date mtime) {
        time = mtime;
    }
    date gettime() {
        return time;
    }
    void detime() {
        //改为用函数输出信息
        time.show();
    }

    void setresult(int mresult) {
        result = mresult;
    }
    bool getresult() {
        return result;
    }
    void deresult() {
        cout << result << endl;
    }
};
int main() {
    return 0;
}

改好了，解释写在注释里，有什么问题可以随时问我

int main(){
return 0;
}
main函数里面要构造类，调用相关函数才有输出哦