What are macros and what are its advantages and disadvantages?

Macros are preprocessor statements which will have specific set of instructions which are repeated in source code for several times and which wil be replaced at every call made 1. Reduce source code length 2. Prog more readable 3.

Any modification to instructions in macro reflects in every call 4. No performance drawback by macros 1. Every call will be replaced and hence internally code length will be large.

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