what are macros?what are its advantages and disadvantages in
c language?
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Answer Posted / ravi ranjan
A macro is a name given to a block of C statements as a
pre-processor directive. Being a pre-processor, the block of
code is communicated to the compiler before entering into
the actual coding (main () function). A macro is defined
with the preprocessor directive, #define.
Like::: #define A 10
#define SUM(x,y) ((x) + (y))
Advantages :::
1.Symbolic constants are evaluated by the PRE-processor,
i.e. they are re-written as literal values, not as
variables. this has some nice side-effects that you can do
using symbolic defines eg. macros and functions inside them.
run-time access to symbolic constants should be
significantly faster than access to variables.
opposite to that, variables (and constants) are evaluated by
the processor (compiler).
2. It is easy to modify the value of the constant
variable,since we have to change the value at the macro
defintion only
DisAdvantages:::
1. Macros are not useful when the function definitions are
Big and when the function is used many number of times.
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