C++ quiz. Which class <b>A</b> declarations will produce the

Which class A declarations will produce the compilation error in an attempt to create the class object

```
struct A
{
     const int a;
};
```

struct A
{
    A() : a(3) {}
     const int a;
};

```
struct A
{
    int a;
};
```
```
struct A
{
    int& a;
};
```

struct A
{
    A(int& b) : a(b){}
    int& a;
};

Explanation

Due to the fact, that all the constants and references should be initialized, the class containing a reference or constant members, couldn't be constructed by default. That's why for class A declarations options:

struct A
{
     const int a;
};

and

struct A
{
    int& a;
};

You must explicitly create the appropriate constructor, in which constant or reference will be initialised.

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