在初始化指向成员函数的指针数组时需要一些帮助

Question

I'm very new to programming & came across a program in a book i'm reading.I get a compile error in it.

The error says "variable-sized object 'ptrFunc' may not be initialized".(it points to the end of the array)

Please advise,what is wrong in it.Thanks in advance.

#include<iostream>

using namespace std;

class cDog
{
    public:
            void speak() const
            {
                cout<<"\nWoof Woof!!";
            }
            void move() const
            {
                cout<<"\nWalking to heel...";
            }
            void eat() const
            {
                cout<<"\nGobbling food...";
            }
            void growl() const
            {
                cout<<"\nGrrrgh...";
            }
            void whimper() const
            {
                cout<<"\nWhinig noises...";
            }
            void rollOver() const
            {
                cout<<"\nRolling over...";
            }
            void playDead() const
            {
                cout<<"\nIs this the end of little Ceaser?";
            }
};

int printMenu();

int main()
{
    int selection = 0;
    bool quit = 0;
    int noOfFunc = 7;
    void (cDog::*ptrFunc[noOfFunc])() const = {

    &cDog::eat,
    &cDog::growl,
    &cDog::move,
    &cDog::playDead,
    &cDog::rollOver,
    &cDog::speak,
    &cDog::whimper
    };

    while(!quit)
    {
        selection = printMenu();

        if(selection == 8)
        {
            cout<<"\nExiting program.";
            break;
        }
        else
        {
            cDog *ptrDog = new cDog;
            (ptrDog->*ptrFunc[selection-1])();
            delete ptrDog;
        }
    }
    cout<<endl;

    return 0;
}

int printMenu()
{
    int sel = 0;

    cout<<"\n\t\tMenu";
    cout<<"\n\n1. Eat";
    cout<<"\n2. Growl";
    cout<<"\n3. Move";
    cout<<"\n4. Play dead";
    cout<<"\n5. Roll over";
    cout<<"\n6. Speak";
    cout<<"\n7. Whimper";
    cout<<"\n8. Quit";
    cout<<"\n\n\tEnter your selection : ";
    cin>>sel;

    return sel;
}

Answer 1

void (cDog::*ptrFunc[noOfFunc])() const = {

noOfFunc is not const-qualified; you would need to declare it as a const int to use it as an array size (the size of an array has to be known at compile time).

However, when you declare an array like an initializer as you do here, you can omit the size; the compiler will determine it from the number of elements in the initializer. You can simply say:

void (cDog::*ptrFunc[])() const = {

Answer 2

`Change it as

void (cDog::*ptrFunc[7])() const = 

or

void (cDog::*ptrFunc[])() const =