What are primitive types default-initialized to in C++?

Question

When I use an initialization list:

struct Struct {
    Struct() : memberVariable() {}
    int memberVariable;
};

the primitive type (

Answer 1

It depends on how you instantiate a class, if you use ClassName() the POD classes are default initialized to zero for non POD class default constructor is called but if you use ClassName, without the parentheses no default initialization takes place.