Correct "Some Problems of C ++ test questions"

It seems that a teacher has done something wrong. correct it. c ++ is too annoying.

I,

Which of the following statements about static data members is true?

A: static data members can be initialized in the class body.
B: static data members cannot be called by class objects.
C: static data members cannot be controlled by private controllers.
D: static data members can be called directly by class names.

Answer:

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A: static data members can be initialized in the class body.
A: Yes.
I remember that only static and constant INTEGER (and compatible) data members can be initialized in the class body, for example:
Class coo
{
Public:
Static const int zero = 0; // OK
Static const double DZero = 0.0; // Some compilers are supported, but I remember
// The C ++ standard does not work. Maybe I remember it wrong.

Static int IIi = 1; // certainly not compiled: too many static data members are not allowed!
};
-------------------------------------------
B: static data members cannot be called by class objects.
A: Yes.
You can use an object to call static data members.
For example, you can:
Coo O;
Cout <O. Zero <Endl;
-------------------------------------------
C: static data members cannot be controlled by private controllers.
Error!
-------------------------------------------
D: static data members can be called directly by class names.
Yes. The only correct answer.

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Ii. "basic question: when a derived class has multiple base classes, the instance of the derived class calls the constructor of the base class by () during initialization.

A: declare the order of these base classes
B: The order in which the list of constructors in the derived class appears

A: A is correct. B error.

That is, left to right. If the initialization order and parent class declaration order are incorrect, the compiler insists on generating calls in the order described by a and may give a warning.

III,

Which structure in STL is sequential storage ()

A: Map
B: Set
C: List
D: Vector

A: d. The Standard specifies that the element data stored in the vector must be continuously stored in the memory.

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