What are Macros in C? Macros/preprocessor directives-Important topic in C programming language-computer science/Information technology

Macros are preprocessor directives in C, a very important topic in C, are used at the top of the C program. It is nothing but a constant value that you have to declare at the starting of the program.

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For example,

#define P 11.20

Here if you use P in any part of the program then it is nothing but 11.20.

It should be define on the top,

#include<stdio.h>

#define P 11.20

int main()

{

    //code

}

There are some major pre-defined macros which you can use in the program.

_ _ DATE _ _ For the current date.

_ _ TIME _ _ For the current time. 

_ _ FILE _ _ For getting the current file name.

_ _ LINE _ _ For getting the current line number.

And even you can define the function in macros as,

#define ADD(a,b) a+b

where just use ADD(a,b), it will return a+b in the value. 

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