Answers for "c macros"

cpp macro

#define PRINT(x) std::cout << x << std::endl

c macros

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

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.