#defining constants in C++

Question

In various C code, I see constants defined like this:

#define T 100

Whereas in C++ examples, it is almost always:

const int T =         


        

Answer 1

Due to the differences between the concepts of constant in C and C++, in C we are basically forced to use #define (or enum) most of the time. const just doesn't work in C in most cases.

But in C++ there's no such problem, so it is indeed bad practice to rely on #defined constants in C++ (unless you really need a textually-substituted constant for some reason).