This document provides information about different types of tokens in the C programming language. It discusses that tokens are the smallest individual units in C and includes keywords, identifiers, constants, strings, special symbols, and operators. Keywords are reserved words that cannot be used as identifiers, while identifiers name variables, functions, and arrays. Constants represent fixed values and include numeric, character, integer, and real values. Strings are arrays of characters ended by a null character. Special symbols represent operations like brackets, braces, and parentheses. Operators perform logical and mathematical functions.

2.  Course Code: CSE-121
 Course Title: Computer Programming
 Submitted To:
 M.Nahid Reza
 Lecturer, Dept. of EEE
 Daffodil International University
 Submitted by:
 01.Ripon Hossain ID:172-33-4008
 02. Naeem Hasan ID:172-33-4135
 03.Md.Shamim Ahosan ID:172-33-4207
 Section: B
 Dept. of EEE (Evening)
 Daffodil International University
 Date of Submission: August 16, 2017

3. C TOKENS
Presentation Topic

4. Introduction to C Tokens
Types of C Tokens
Keywords
Identifiers
Constants
Strings
Special Symbols
Operators
Objectives

5. In a Passage of text,indiviual words and punctuation
marks are called tokens.similarly in C programming the
smallest individual units are known as C tokens.
C language has six types of tokens, and programs are
written using these tokens, and the syntax of the
language.
Introduction to C Tokens

6. C Tokens
Keywords Identifiers Constants Strings
Special
Symbols
Operators
Types of C Tokens

7.  Keywords serves as the building blocks for a program statements.All
keywords have a fixed meaning and cannot be changed.
 Keywords cannot be used as normal identifier names.
 Few examples of keywords used in C are listed below.
Int
break
goto
char
switch
void
Keywords

8.  Identifier refers to the name of variables,functions and arrays.These are
user defined names and consists of a sequence of letters and digits.
 Both uppercase and lowercase letters can be used,and C language is
case sensitive A special symbol underdscore(_) is also permitted.
 Rules for Identifiers:
 First character must be an alphabet.
 Must consist of only letters,digits or underscore.
 Should not be a keyword should not have any blank space.
 Example:-int num;
char name;
Where num and name are identifier names.
Identifiers

9.  Constants refers to fixed values that do not change during the execution of a
program.
 Basic types of C constants are shown in the flowchart.
constants
Numeric
constants
Character
constants
Integer
constants
Real
constants
Single
Character
constants
String
constants
Constants

10.  Strings are nothing but array of characters ended with null character
(“0”).This null character indicates the end of the string.
 Strings are always enclosed by double quotes. Wheras,character is
enclosed by single quotes in C.
Example:-char name [10];
In this example the variable name can store up to 10 bytes.
Strings

11.  The following special symbols are used in C having some special
meaning and thus,cannot be used for some other purpose.
[ ] ( ) { } , ; : * … = #
Braces{}:These opening and ending curly braces marks the start and
end of a block of code containing more then one executable statement.
Parentheses():These special symbols are used to indicate function
calls and functions parameters.
Brackets[]:opening and closing brackets are used as array element
reference.these indicate single and multidimensional subscripts.
Special
Symbols

12.  The symboles which are used to perform logical and mathematical operations in
a C program are called C operators.
 Operators used in C program are
 Arithmetic operators
 Assignment operators
 Relational operators
 Logical operators
 Bit Wise operators
 Conditional operators(ternary operators)
 Increment/decrement operators
 Special operators
Operators