Отправлено: 30.10.12 07:02. Заголовок: Template for class

#include <iostream> 
 #include <string> 
  
 using namespace std; 
  
 template< class T > 
 class Employee{ 
 private: 
 	T EmployeeID , EmployeeSalary; 
 public: 
 	T Employee( T theID , T theSalary ){ 
 		EmployeeID = theID; 
 		EmployeeSalary = theSalary; 
 	} 
 }; 
  
 template< class T > 
 class Student{ 
 private: 
  
 public: 
 	T Student(){} 
  
 }; 
  
 int main(){ 
  
 	Employee <> theEmployee( 2 , 3000 ); 
 	Student <> theStudent (); 
  
 	system( "pause" ); 
 	return 0; 
 }

what i done so far

and this the question given
And here is the question given
Create a class template for a class that holds an object and the number of data elements in the object. For example, if an Employee class has two data elements, an ID number and a salary, then the class template holds the number 2 and an Employee object; if a Student class contains 12 data elements, then the class template holds 12 and a Student object. Write the code for standard input function for the object that displays a message on the screen – “You will be ask to enter X items” – where X is the number of data elements. Write a main() function that tests your template class with an integer and two programmer-defined classes
am i doing correctly until now?

 Отправлено: 31.10.12 14:19. Заголовок: Number 2 is fixed fo..

Number 2 is fixed for your class Student. It is the number of class members that will get values in inputItems.

 Отправлено: 31.10.12 14:25. Заголовок: beside that . how i ..

beside that . how i show out what the object pass in?

JUST EXAMPLE:
Object : Employee
You will be asked to enter 2 items

isn't the output should like this too?

 Отправлено: 31.10.12 14:27. Заголовок: ya i know because of..

ya i know because of the
count = numOfData so is it correct? lol

 Отправлено: 31.10.12 15:03. Заголовок: BasicNewbie пишет: ..

BasicNewbie пишет:

цитата:

ya i know because of the count = numOfData so is it correct? lol

Yes, you are right. When an object of Holder is created its template arguments are specified including the number of members of a class used as the template argument

 Отправлено: 31.10.12 15:49. Заголовок: Then how I call the ..

Then how I call the class name out ? I tried a lot of code but fail

 Отправлено: 31.10.12 17:14. Заголовок: I have not understoo..

I have not understood your question. In fact I showed already the full code. You only need to write member function readItems for each class.

 Отправлено: 31.10.12 17:23. Заголовок: I mean that how I sh..

I mean that how I show out the object that I pass to the template? Sohow to display out for the object?

 Отправлено: 31.10.12 17:38. Заголовок: I already wrote all ..

I already wrote all code except the member function readItems of the classes. Reread the thread attentively..

 Отправлено: 31.10.12 19:04. Заголовок: readItems is when i ..

readItems is when i enter the number 2 in the inputItems .
so i can do a looping to call user want to enter what the 2 items are?

mind that can u provide what the output should look like ?
like that i can get it understand easily ..
can?

 Отправлено: 31.10.12 19:11. Заголовок: One more classes Stu..

One more classes Student and Employee shall have a method with the same name for both classes. You have to call this method.

 Отправлено: 31.10.12 19:25. Заголовок: i can't get what..

i can't get what you mean for it
because i not really understand for the last point that u explaining to me
that i asking what should the progrma output look like?
sorry for it because my english not so well .

and the readItems() isn't read the

Holder <Employee , 2> h1; 
 	Holder <Student , 12> h2;

from the main? if 2
so the readItems() from the function will ask user to enter 2 items for it?

if 12 so the readItems() will call user to enter 12 times for the items?

 Отправлено: 31.10.12 20:01. Заголовок: One more in each cla..

One more in each class write a method for entering values for its members. I wil not repeat this any more.

 Отправлено: 01.11.12 04:42. Заголовок: #include <iostre..

#include <iostream> 
 #include <string> 
  
 using namespace std; 
  
 template< class T , int numOfData > 
 class Holder{ 
 private: 
 	T object; 
 	int count; 
 public: 
 	Holder(){ 
 		object = obj; 
 		count = numOfData; 
 	} 
 	void inputItems(){ 
 		cout << typeid(object).name() << endl; 
 		cout << "You will be asked to enter " << count << " items" << endl << endl; 
 		object.inputItems(); 
 	} 
 	void readItems(){ 
 		object.readItems(); 
 	}; 
 }; 
  
 class Employee{ 
 private: 
 	int EmployeeID; 
 	double EmployeeSalary; 
 public: 
 	Employee(){ 
 		EmployeeID = 0; 
 		EmployeeSalary = 0.00; 
 	} 
 	Employee( int theEmployeeID , double theEmployeeSalary ){ 
 		EmployeeID = theEmployeeID; 
 		EmployeeSalary = theEmployeeSalary; 
 	} 
 	void inputItems(){ 
 		cout << "Enter Employee ID : "; 
 		cin  >> EmployeeID; 
 		cout << "Enter Employee Salary : "; 
 		cin  >> EmployeeSalary; 
 	}; 
 	void readItems(){ 
 		cout << "\nEmployee ID : " << EmployeeID << endl 
 			<< "Employee Salary : " << EmployeeSalary << endl << endl; 
 	} 
 }; 
  
 class Student{ 
 private: 
 	int numOfDataElements; 
 public: 
 	 
 	Student(){ 
 		numOfDataElements = 0; 
 	} 
 	Student( int numOfData ){ 
 		numOfDataElements = numOfData; 
 	} 
 	 
 	void inputItems(){}; 
 }; 
  
 int main(){ 
 	Student student; 
  
 	Holder <Employee , 2> h1; 
 	Holder <Student , 12> h2; 
 	h1.inputItems(); 
 	h1.readItems(); 
 	h2.inputItems(); 
  
 	system( "pause" ); 
 	return 0; 
 }

so for my class Employee. am i doing correctly for all?
and beside that . i have a seriously question to ask u ya .
if i comment out for the constructor for each class .
the program still work?
so the constructor actually is unused ?

 Отправлено: 01.11.12 19:25. Заголовок: I showed you already..

I showed you already how class Holder should look.

 template< class T , int numOfData >   
 class Holder 
 {   
 private:  	 
    T object;  	 
    int count = numOfData;   
  
 public:  	 
    //Holder() { count = NumOfData; } // The consttructor is not required if the compiler supports the initialization of  class members in class definition 
   
    void inputItems() 
    { 
       std::cout << "You will be asked to enter " << count << " items" << std::endl; 
       object.inputItems(); 
    } 
 }; 
 . 

So the only thing that you have to do is to define classes Student and Employee and inside them define a method inputItems. That is all.