What is the difference between a macro and a const in C++?

I was asked this question in a technical interview:

What is the difference between a const and a macro in C++?

My answer was that a macro is a preprocessor directive and it could be difficult to debug the application if you use a macro since it is replaced with the constant expression before compilation, whereas a const can have a type identifier and is easy to debug.

Could anyone point out any other difference and which should be preferred?

EDIT:

From the IBM documentation for C++:

The following are some differences between #define and the const type qualifier:

1. The #define directive can be used to create a name for a numerical, character, or string constant, whereas a const object of any type can be declared.

2. A const object is subject to the scoping rules for variables, whereas a constant created using #define is not. Unlike a const object, the value of a macro does not appear in the intermediate source code used by the compiler because they are expanded inline. The inline expansion makes the macro value unavailable to the debugger.

3. A macro can be used in a constant expression, such as an array bound, whereas a const object cannot. (I think we surely need to use macro to define array_size.

4. The compiler does not type-check a macro, including macro arguments.