Assigning a value to a static field

[ZeroesAndOnes]

#include <iostream>
using namespace std;


class Order{
    private:
        static double minimumCharge;
        int tableNum;
        string serversName;
        int numOfPatrons;
    public: 
        void getTableNum(int);
        void getNumOfPatrons(int);
        void getServersName(string);
        int displayTableNum();
        string displayServersName();
        int displayNumOfPatrons();
};


double Order::minimumCharge = 4.75;


void Order::getTableNum(int num){
    tableNum = num;
}
void Order::getNumOfPatrons(int numPt){
    numOfPatrons = numPt;
}
void Order::getServersName(string name){
    serversName = name;
}
int Order::displayNumOfPatrons(){
    return numOfPatrons;
}
int Order::displayTableNum(){
    return tableNum;
}
string Order::displayServersName(){
    return serversName;
}
int main(void){
    cout << Order::minimumCharge;
    return 0;
}

ON the line 21 error: 'double Order::minimumCharge' is private.
Why is this type of assigning wrong with private fields?

[laserlight]

ON the line 21 error: 'double Order::minimumCharge' is private.
Why is this type of assigning wrong with private fields?

That is not an error; that is what the error message refers to. The error is in trying to access it directly from within the main function:

cout << Order::minimumCharge;

[ZeroesAndOnes]

That is not an error; that is what the error message refers to. The error is in trying to access it directly from within the main function:

cout << Order::minimumCharge;

There is no way to access it directly from the main function?

[Salem]

You need to implement and call

double Order::getMinimumCharge ( void ) {
  return minimumCharge;
}

The fact that you made the member variable static doesn't remove any of the 'private' attributes of the member. It's still just as inaccessible to anything declared outside the class.

[ZeroesAndOnes]

You need to implement and call

double Order::getMinimumCharge ( void ) {
  return minimumCharge;
}

The fact that you made the member variable static doesn't remove any of the 'private' attributes of the member. It's still just as inaccessible to anything declared outside the class.

Yes I am aware of that way of accessing private data.
In the task it said:
"Write a class definition for an Order class for a nightclub that contains a table number,a server’s name, and the number of patrons at the table. Include a private static datamember for the table minimum charge, which is $4.75. Write a main()function that delcares NO Order OBJECTS, but that uses a static member function to display the tableminimum charge."

[laserlight]

Read carefully: "Write a main()function that delcares NO Order OBJECTS, but that uses a static member function to display the tableminimum charge."

That is, you are not supposed to access Order::minimumCharge directly, but via a static member function that is public.

[ZeroesAndOnes]

Read carefully: "Write a main()function that delcares NO Order OBJECTS, but that uses a static member function to display the tableminimum charge."

That is, you are not supposed to access Order::minimumCharge directly, but via a static member function that is public.

So this is the program using static member function?

#include <iostream>
using namespace std;
 
 
class Order{
    private:
        static double minimumCharge;
        int tableNum;
        string serversName;
        int numOfPatrons;
    public: 
        void getTableNum(int);
        void getNumOfPatrons(int);
        void getServersName(string);
        int displayTableNum();
        string displayServersName();
        int displayNumOfPatrons();
        double returnMinimumCharge();
        static void displayMinimumCharge();
};
 
 
double Order::minimumCharge = 4.75;
 
 
void Order::getTableNum(int num){
    tableNum = num;
}
void Order::getNumOfPatrons(int numPt){
    numOfPatrons = numPt;
}
void Order::getServersName(string name){
    serversName = name;
}
int Order::displayNumOfPatrons(){
    return numOfPatrons;
}
int Order::displayTableNum(){
    return tableNum;
}
string Order::displayServersName(){
    return serversName;
}
double Order::returnMinimumCharge(){
	return minimumCharge;
}
void Order::displayMinimumCharge(){
	cout << "Minimum charge: " << minimumCharge;
}
int main(void){
   	
   	Order::displayMinimumCharge();
    return 0;
}