Create a class that represents an employee. this class will have three constructors to initialize variables. if the constructor doesn't provide a parameter for a field, make it either "(not set)" or "0" as appropriate.

Following are the class  employee in which we create a three constructor  to initialize variables.

class employee// class

{

   public:

   int ID,age1 ; // variables

   string name1;

   employee() // constructor initialize the member with 0 when no constructor is called  

   {

     name1="0";

     age1=0;

     ID=0;

     cout<<ID<<name1<<age1;

   }

   employee(int id ,string name ,int age ) // constructor 2

   {

      ID=id;

      name1=name;

       age1=age;

       cout<<ID<<name1<<age1<<endl;

   }

   // Copy constructor

   employee(const employee(&p2) ) // constructor3

   {

       ID= p2.ID;

      name1 = p2.name1;

      age1=p2.age1;

       cout<<ID<<name1<<age1<<endl;

   }

};

Explanation:

Here  we create a class employee and create a three variable  ID,age1 and name1 initially  we create a default constructor in this we set all variable to 0 this constructor is call when doesn't provide any parameter to constructor after that we create a parametrized and copy constructor.In the main function we call these constructor .

Following are the program in c++ language

#include <iostream> // header file

#include <string>

using namespace std;

class employee// class

{

   public:

   int ID,age1 ; // variables

   string name1;

   employee() // constructor initialize the member with 0 when no constructor is called  

   {

     name1="0";

     age1=0;

     ID=0;

     cout<<ID<<name1<<age1;

   }

   employee(int id ,string name ,int age ) // constructor 2

   {

      ID=id;

      name1=name;

       age1=age;

       cout<<ID<<name1<<age1<<endl;

   }

   // Copy constructor

   employee(const employee(&p2) ) // constructor3

   {

       ID= p2.ID;

      name1 = p2.name1;

      age1=p2.age1;

       cout<<ID<<name1<<age1<<endl;

   }

};

int main() // main function

{

cout<<"first constructor"<<endl;

employee e; // call constructor doesn't provide a parameter

cout<<endl<<" second constructor"<<endl;

employee e1(13,"ss",67);// call the second constructor

cout<<" third constructor"<<endl;  

employee p2 =e1;// call third constructor

return 0;

}

Output:

first constructor

000

second constructor

3ss67

third constructor

3ss67