I created an object. How can I use the copy constructor to copy its members to another object and modify some members?

Copy constructors can only copy , To modify, you need to call the member function to modify .
You need to add... To your code get Method to get the member variable , In this way, we can get... In the assignment constructor e Properties of .
There are still some errors in your code ,set There is no need to use a pointer in the method .
The code is modified as follows ：

#include <iostream>#include <string>using namespace std;class Employee{public:    Employee()    {        name=" Zhang San ";        adress=" Peking University, ";        city=" The Beijing municipal ";        postcode="421001";    }    Employee(Employee &e){        this->name = e.getname();        this->city = e.getcity();        this->adress = e.getadress();        this->postcode = e.getpostcode();    };    void setname(string n);    void setadress(string a);    void setcity(string c);    void setpostcode(string p);    string getname(){
   
   
   
   return name;}    string getadress(){
   
   
   
   return adress;}    string getcity(){
   
   
   
   return city;}    string getpostcode(){
   
   
   
   return postcode;}    void display();private:    string name;    string adress;    string city;    string postcode;};void Employee::setname(string n){    name=n;};void Employee::setadress(string a){    adress=a;};void Employee::setcity(string c){    city=c;};void Employee::setpostcode(string p){    postcode=p;};void Employee::display(){    cout<<"name="<<name<<endl;    cout<<"adress="<<adress<<endl;    cout<<"city="<<city<<endl;    cout<<"postcode="<<postcode<<endl;};int main(){    string n,a,c,p;    Employee E1;    cin>>n>>a>>c>>p;    E1.setname(n);    E1.setadress(a);    E1.setcity(c);    E1.setpostcode(p);    E1.display();    Employee E2(E1); // Call copy constructor     E2.setname("haha"); // Call the method to modify the property     return 0;}

Employee(Employee &e), This is the copy constructor , But you wrote an empty