What is the difference between const and macro?

Answer:

• The const keyword is handled by the compiler, in another hand, a macro is handled by the preprocessor directive.
• const is a qualifier that is modified the behavior of the identifier but macro is preprocessor directive.
• There is type checking is occurred with const keyword but does not occur with #define.
• const is scoped by C block, #define applies to a file.
• const can be passed as a parameter (as a pointer) to the function. In the case of call by reference, it prevents to modify the passed object value.