Macros in c language

Welcome to c programming learning

Last post programs outputs
1. 3
2. 5

Now we are going to learn about macros in c programming

MACROS

Macros are very useful. These are beginning of the program or above the main() function.

Let , #define is used to indicate macros 

Macros are as follows...

1. Define something with their alias names then we use #define

Examples------ #define printf pf

Here we can use pf in the place of printf 

2. Header files

#include<stdio.h>

In this we # that means pre processor. In this pre processor is execute first.

3. Conditional

In this we use condition loops that is if ,else 

With beginning of  #.

That is #if, #else

4. If there is defined something previously that can be remove defined that is by using #undefined

Examples------

 #defined d 15

#undefined d 15

 To make undefined of d value


Give the output below in comment section

#include<studio.h>
#define n 15
void main()
{
   printf("%d",n);
}

Output:-