ABOUT BASIC OF 'C'

1. Presentation
of
C
Subject :- Introduction to C
Submitted to:-
Miss. Diya Sharma Submitted by :-
Lovepreet (023)

2. C language
 C is a general purpose structured powerful modern language. It is a high level language and
low level too.
 This language was designed for developing fast, reliable , efficient, economical and portable
system software.
 Built-in functions
 More operators then other
 Simple to learn

3. Algorithum
 a sequence of instructions designed in such a way that if the instructions are executed in some specified sequence,
the desired result will be obtained.
 Ex:-
STEP 1 : INPUT a, b,
STEP 2 : sum = a+b
Step 3 = Write “Sum of two number”, SUM
Step 4 = END

4. Compiler and Interpreator
 Compiler converts all the source code into machine code, creating an
executable file.
 As interpreter also converts source code to machine code and it done only a
line at a time

5. Character set
Character set means that the characters and symbols that a C program can
understand and accept. These are grouped from the commands, expressions, words,
co-statements and other tokens for C language.
Character set is the combination of alphabet, digit, special characters and white
space.
EXAMPLE= ,..,/,;,’,[,], and so on.
Characterset
Letter
digit
Empty space
character
Special
character

6. Keywords and identifiers
 There are mainly 40 keywords among which 32 are used by many C-compilers.
 Example= auto, char, break, case, goto, int, return, if, float and many more.
 “INDENTIFIERS” are some words or name which identify whether it is a
constant or variable.

7. TOKENS
 the blank space are called tokens. In c program all the C- statements having keywords, identifiers, constant, strings,
operators and special symbols are called c-tokens.
 For example , some C-tokens used in a c-programing are:
Reverse words: float, do, if etc
Constant : 300.9, 20.99, -098 etc
Strings: “raman”, “2002-03”etc
Operators: +,=,-,<> etc
Special symbols:{},[],() @, #, $, % etc

8. Identifiers
 Iis a string of alphanumeric characters
 . They are used to name variables, arrays, functions.
 It begins with the alphabetic character.
 Must not contain white space
 Connot use keyword as identifiers

9. keywords
 Predefined meaning in a language.
 Auto, do, for, else, new, try, char, int and so on.

10. Literal or constant
 Whose value cannot change during program execution.
 Commas and blanks spaces cannot be included
 E.g= 12,1.2,0XF and so on