Write a class in c++

Question

Write a class definition for an order class for a nightclub that contains a table number, a servers name, and the number of patrons at the table. Include a private static data member for the table minimum charge, which is $4.75. Write a main() function that declares no object of order class type, but uses a static member function to display the table minimum charge.

Answer 1

This sounds like a homework assignment - are you having trouble with the static class member? A static class member is the member of all instances of an object. You declare it in the class, same as any other member, but with the static keyword. You must then declare an instance of the member, where it can be instantiated. Usually this is done in the .cpp file of the same name as the .h file.

header file:

class Example

{

public:

Example();

private:

static int var_x;

};

class file:

#include "example.h"

int Example::var_x = 70;

Example::Example()

{

}

Static functions are similar to regular functions, only they can be called without instantiating an instance of the class object:

class Example

{

public:

Example();

static int getValue() { return var_x; }

private:

static int var_x;

};

In main, you can get the reference the static function like so:

#include <iostream>

#include "Example.h"

int main()

{

int my_val = Example::getValue();

std::cout << "The example value is: " << my_val << std::endl;

return 0;

}

Hope this helps your assignment.