Answer / d g patel

1. Macro takes parameters where as ordinary definition does
not.
2. Based on the parameter values to macro it can result in
different value at run time. Ordinary defination value
remains same at all place at run time.
3. Macro can be used for conditional operations where as
definition can not.
4. Using macro one can achieve inline functionality in C
ie. macro can be a function performing simple operations.
This is not possible using definitions.

Answer / ambar

macro is an independently executive function which executes
only when called from within the calling program . each
time it is called it takes a different parameter whearas an
ordinary defination parameters remains same till the life
of a program.

Answer / himanshu goel

macro definitions can be used for conditional compilation
whereas ordinary cannot

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