Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

C Programming Fundamentals: Keywords, Identifiers, Variables, and Data Types, Schemes and Mind Maps of Computer science

Computer science

A concise overview of fundamental concepts in c programming, including keywords, identifiers, variables, constants, and data types. It explains the rules for naming identifiers, the purpose of variables and constants, and the different types of data available in c. The document also includes a code snippet demonstrating the use of the sizeof() operator to determine the size of various data types. This is useful for high school students learning the basics of c programming.

Typology: Schemes and Mind Maps

2025/2026

Available from 09/17/2025

vrushabh-lokhande
vrushabh-lokhande 🇮🇳

7 documents

1 / 3

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Keywords:
Keywords are predefined, reserved words used in programming that have special meanings to the
compiler. Keywords are part of the syntax and they cannot be used as an identifier.
As C is a case sensitive language, all keywords must be written in lowercase.
C Keywords
auto
double
int
struct
break
else
long
switch
case
enum
register
typedef
char
extern
return
union
continue
for
signed
void
do
if
static
while
default
goto
sizeof
volatile
const
float
short
unsigned
Identifiers:
Identifier refers to name given to entities such as variables, functions, structures etc.
Also remember, identifier names must be different from keywords.
Rules for naming identifiers
A valid identifier can have letters (both uppercase and lowercase letters), digits and
underscores.
The first letter of an identifier should be either a letter or an underscore.
You cannot use keywords like int, while etc. as identifiers.
There is no rule on how long an identifier can be. However, you may run into problems in
some compilers if the identifier is longer than 31 characters.
pf3

Partial preview of the text

Download C Programming Fundamentals: Keywords, Identifiers, Variables, and Data Types and more Schemes and Mind Maps Computer science in PDF only on Docsity!

Keywords:

Keywords are predefined, reserved words used in programming that have special meanings to the compiler. Keywords are part of the syntax and they cannot be used as an identifier. As C is a case sensitive language, all keywords must be written in lowercase. C Keywords auto double int struct break else long switch case enum register typedef char extern return union continue for signed void do if static while default goto sizeof volatile const float short unsigned

Identifiers:

Identifier refers to name given to entities such as variables, functions, structures etc. Also remember, identifier names must be different from keywords.

Rules for naming identifiers

 A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores.  The first letter of an identifier should be either a letter or an underscore.  You cannot use keywords like int, while etc. as identifiers.  There is no rule on how long an identifier can be. However, you may run into problems in some compilers if the identifier is longer than 31 characters.

Variables

A variable is a container to hold data. To indicate the storage area, each variable should be given a unique name. the variable type cannot be changed once it is declared. For example: int number = 5; // integer variable number = 5.5; // error double number; // error

Constants

If you want to define a variable whose value cannot be changed, you can use the const keyword. This will create a constant. For example, const double PI = 3.14;

Data-types:

A data type specifies the type of data that a variable can store such as integer, floating, character, etc. Data types are declarations for variables. This determines the type and size of data associated with variables. Types of data types in C language. Types Data Types Basic Data Type Int(%d), char(%c), float(%f), double(%lf) Derived Data Type array, pointer, structure, union Enumeration Data Type enum Void Data Type void