difference between constants and macros

[bagavathi]

Hi friends,

constants and macros what is the major difference?. and which is best ?

somebody said macros reduce the program size and in increase speed. someone says if increase the macros it will reduce the speed. which is correct.

 

[Venkadesh_M]

Macro is the fastest, but whenever you used a macro that will be replaced by the constant (by pre processor)and stored on the ROM but if you use a const it will store only once and take it to operate, operationally there is no difference...