C macros

Macros in c

A macro is defined at the top of your program.
for eg: #define PI 3.14
Now whenever you write PI in your program 'PI' is replaced by 3.14
Actually this replacement is done by the preprocessor before the source code is compiled.

C macros

/* 
Every time the program encounters circleArea(argument),
it is replaced by (3.1415*(argument)*(argument)).
*/
#define circleArea(r) (3.1415*(r)*(r))

Source: programiz.com

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