Ôîðóì » C/C++ äëÿ íà÷èíàþùèõ (C/C++ for beginners) » Template for class » Îòâåòèòü
Template for class
BasicNewbie1: [pre2]#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; }[/pre2] 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?
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Ñûðîåæêà: Number 2 is fixed for your class Student. It is the number of class members that will get values in inputItems.
BasicNewbie: 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?
BasicNewbie: ya i know because of the count = numOfData so is it correct? lol
Ñûðîåæêà: BasicNewbie ïèøåò: 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
BasicNewbie: Then how I call the class name out ? I tried a lot of code but fail
Ñûðîåæêà: 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.
BasicNewbie: I mean that how I show out the object that I pass to the template? Sohow to display out for the object?
Ñûðîåæêà: I already wrote all code except the member function readItems of the classes. Reread the thread attentively..
BasicNewbie: 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?
Ñûðîåæêà: One more classes Student and Employee shall have a method with the same name for both classes. You have to call this method.
BasicNewbie: 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 [pre2]Holder <Employee , 2> h1; Holder <Student , 12> h2;[/pre2] 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?
Ñûðîåæêà: One more in each class write a method for entering values for its members. I wil not repeat this any more.
BasicNewbie: [pre2]#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; }[/pre2] 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 ?
Ñûðîåæêà: I showed you already how class Holder should look. [pre2] 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(); } }; . [/pre2] 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.
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