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

Question

I was asked this question in a technical interview:

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

My a

Answer 1

Macros don't respect scope, and a macro's name may not be available to a symbolic debugger. Dan Saks has a fairly complete article on the relative merits of macros (none), constant objects, and enumeration constants. Like Stephen Dewhurst, Saks prefers enumeration constants for integer values since they take up no storage (more precisely, enumeration constants have neither storage duration nor linkage).