What Is The Difference Between #define And Constant In C?

1.	What Is The Difference Between #define And Constant In C?
Answer» A #define is used as immediate constant or as a macro. Where as the constant is a variable WHOSE VALUE can not CHANGE. Pointer can be DECLARED to a constant, but not for #define. #define can not define EXTERNALLY, and there is no way to use it for availability to the linker. Where as the constant can be global .

Answer»

A #define is used as immediate constant or as a macro. Where as the constant is a variable WHOSE VALUE can not CHANGE.
Pointer can be DECLARED to a constant, but not for #define.
#define can not define EXTERNALLY, and there is no way to use it for availability to the linker. Where as the constant can be global .

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