C language keywords and their types| identifiers | printf, scanf

C language keywords:- Hello dear students if you are searching for C language keywords. keywords and their types| identifiers | printf,scanf,, you come on the true blog. c language full of keywords and functions.

if you want to learn about c language keywords, we will provide you best notes. that I write in my notebook.

Hello friends today in this post . I tell you about C language keywords and their types, identifiers, and their functions and definitions with examples.

C language keywords and their types| identifiers | printf,scanf
C language keywords and their types| identifiers | printf,scanf

what is the C language keywords ?

Keywords are the words hoes meaning has already been known to the compiler. there are 32 keywords in the C language.

keywords in c language

  1.   Auto
  2.         Char
  3.         Break
  4.         Case
  5.         Constant
  6.         Continue
  7.         Default
  8.         Do
  9.         Double
  10.         Else
  11.         enuam
  12.         extern
  13.         float
  14.         for
  15.         goto
  16.         if
  17.         int
  18.         long
  19.         register
  20.         return
  21.         short
  22.         signed
  23.         size of
  24.         static
  25.         struct
  26.         switch
  27.         type def
  28.         union
  29.         unsigned
  30.         void
  31.         volatile
  32.         while

 Identifier: ANSI

rules for identifiers

American national standards institute c language)

  1. The first letter must be alphabet or
  2. The second character is allowed
  3. Only digit alphabet underscores are allowed not symbols allowed
  4. Keywords cannot be and use identifier Length 32 or more than.

Structure of C language program

  1. A c program consists of one or more functions.
  2. A function is a set of statements and variables. The statement specifies the computing operation table 10 and the variable holds the value of computation.
  3. Every c program must have a function man execution of a C program begins at the beginning of man.
  4. The main function is a special function used by C function tell the program.

*START every program must have exattly main function. If we used more than one function.

* The compiler can not tell which are mark the beginning of the program Main function has no argument.

# include<stdio.h>

The beginning of all programs that uses any input output library function.


Printf is a pre-defined standard C function for printing output. It is a function that has already been written and compiled linked together. With our program.

The main function

The main function is a part of the C program. Permit different forms of the main statements are allowed. printf and scanf are functions defined in the standard library functions are defined in<stdio.h>

Scanf(“             “)

Which can read data from keywords and specify the address of the location where data is read. Basically scanf function is used for inputting data from the user.

   Note.  :-  In C language everything is written in lowercase.

header file

The header file provides information to the compiler on the function and other values. We use it in our program. We need to # include<stdio.h> provides information of printf and scanf function.

library function

the beginning of all programs that use only input and output library functions.



read these informative articles

 C language keywords summery

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