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What are macros? What are its advantages and disadvantages?

Macros are abbreviations for lengthy and frequently used statements. When a macro is called the entire code is substituted by a single line though the macro definition is of several lines.

The advantage of macro is that it reduces the time taken for control transfer as in case of

function.

The disadvantage of it is here the entire code is substituted so the program becomes

lengthy if a macro is called several times.