C is a powerful, structured programming language developed by Dennis Ritchie. It is a high-level language with low-level features that provides easy readability through comments. A C program is written, saved, compiled to check for errors, and then executed. There are six types of tokens in C - keywords, identifiers, constants, strings, special symbols, and operators - which are the smallest units that make up a C program. Variables are used to store values that can change during program execution, while constants represent fixed values. C supports several data types including integers, characters, floating-point numbers, and void.

1. INTRODUCTION OF C
LANGUAGE
By
Kirti sachan

2. ALL ABOUT C LANGUAGE :
 C is developed by Dennis Richie
 C is structured programming language
 Comments in c provide easy readability
 C is powerful language
 C is high level language with low level features

3. RUNNING A C PROGRAM
 Type a program
 Save it
 Compile it –it will be converted into exe
(executable)
 Run the program
 (the compiler checks for errors ,if any before
execution )

4. WHAT ARE C TOKENS AND TYPE
OF C TOKENS IN C LANGUAGE
The smallest individual
units in c program . They
are source –program text
which the compiler
doesn’t furthur
breakdowns.

5. There are 6 different types of token in
c
 Keywords (float,int,while etc)
 Identifiers(main ,amount etc)
 Constants ( 17.5 , -23.4 etc)
 Strings ( “hello” , “lets go” )
 Special symbols ( {},[],& )
 Operators ( +,-,*,/ )

6. KEYWORDS
 They have special
meaning to compiler
 They are written only in
lower case
 They are of great
importance in writing a
c program
 There are only 32
keywords available in c

7. CONSTANTS
 Constants are fixed
values which do not
change during program
execution

8. MORE ABOUT CONSTANTS
 Integer constants
 refers to series of digit such as decimal integer ,octal integer ,
hexadecimal integer
 Eg : 121 ,ox2 etc
 Real constants
 The floating point constants such as -0.05 , 9.34
 Single character constants
 It consists of single character enclosed within pair of single quotes (‘ ‘). Eg : ‘ &’ , ‘a’ etc
 String constants
 A string constant
 It is a sequence of characters enclosed within double quotes (“ “ )
 Eg: “ hello”


9. VARIABLES
 It is a data name used to store any value
 Are used to store values which can be changed
during program execution
 Variable names in c
 May only consist of letters , digits and underscores
 First 31 characters are significant
 May not begin with a number
 May not be a keyword
 Should start with letter or underscore(_)
 No other special characters are allowed except
space

10. DATA TYPES

11. 1. INTEGER
 It is a number without a fraction part
 Represents a signed integer of4 or 8 bytes or32 0r
64 bit
 Designed to hold whole numbers
 Can be signed or unsigned
 Eg: 12 -5 7
o Available in different sizes
o Int , short Int and long int
o Size : short int < int < long int

12. CHARACTER
 Represents a single byte of storage i.e 8 bits of
storage
 Used to hold characters like “d” or “a” etc
 Numerical value is associated with character via a
character set
 Numeric value of a character in memory
 Code: memory:
 Char : “place” place
 67

13. 3. FLOATING POINT
 It is a type of number a fractional part
 Designed to hold real numbers
 Eg 12.5 -3.4
 All numbers are signed
 Available in different sizes float<double < long
double

14. 4. VOID
It has no values and no
operations

15. THANK YOU
Hope it was helpful