Class definition?

[samyulg]

I am to write program using a class definition "Bag". I am new to class definition and don't quite understand them. The program is supposed to allow the user to enter a item until the user wants it to stop, and then display that item. I will show you what I have so far. What else to I need? Thank you.

  #include <iostream>
using namespace std;

class Bag
{
  public:
  add();
  display();

};

int main()
{
  Bag grabBag;
  string item;

   // Test add()
  cout << "Enter an item ";
  getline(cin, item);
  while (item != "quit")
   {
     grabBag.add(item);
     cout << "Enter an item or 'quit': ";
     getline(cin, item);
   }
   grabBag.display();
}

[MikeyBoy]

You need to define what Bag::add() and Bag::display() actually do, i.e. write the code for those methods.

This will almost certainly require adding some data members to Bag, to hold whatever data it will need to store.

[seeplus]

to allow the user to enter a item until the user wants it to stop, and then display that item

Presumably to display all the items that were entered?

class member functions need to have a body for them. Also there needs to be member variable to contain the added items (vector?). Consider:

#include <iostream>
#include <string>
#include <vector>

class Bag
{
public:
	void add(std::string& item) { data.push_back(item); }

	void display() const {
		for (const auto& d : data)
			std::cout << d << '\n';
	}

private:
	std::vector<std::string> data;
};

int main()
{
	Bag grabBag;

	for (std::string item; (std::cout << "Enter an item or 'quit': ") && std::getline(std::cin, item) && item != "quit"; grabBag.add(item));

	grabBag.display();
}

Enter an item or 'quit': qwe
Enter an item or 'quit': asd
Enter an item or 'quit': zxc
Enter an item or 'quit': quit
qwe
asd
zxc