Introduction to C Programming Language - PPT (1)

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C (Programming Language)

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History of C

• 1967
• (BCPL (Basic Combined Programming Language)
• Martin Richard at Cambridge University)
• 1970
• (B - Ken Thompson at AT T's Bell
  Laboratories.)
• 1972
• (C - Dennis Ritchie at AT T' Bell Laboratory.)

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Definition of c Language
C is a procedure oriented Structured
programming language . C is a basic programming
language
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• Numeric Constant
• Integer constant
• Eg1,5,67,346 etc.
• Float constant
• Eg2.3,8.45,6.8 etc.
• Character Constant
• Eg a , x , g etc.
• String Constant
• EgHello ,good

Constant in C Language
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DATA TYPES IN C LANGUAGE

• There are two types of Data Types
• Primary Data type
• Secondary Data type

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Primary Data Type
Name Denoted By Format Specifier
Size Integer int d 2
Byte Float float f 4 Byte Character
char c 1 Byte
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Secondary Data Types
1)Pointer 2)Array 3)String 4)Structure
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Variables Of c Language
Variable is a name given to a specific memory
location . Variable is use to hold the values ,
variables are always used with data
types. Variable name can be anything.
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Variables inside Memory

• int num67
• float y5.8
• Char chk

Num67
Y5.8
Chk
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Rules for declaring variable name

• The maximum length of variable name is 8
  characters and minimum is 1.
• Variable name can contain numeric values and
  under score( _ ).
• Eg int num 6
• num_one
• num23
• num_1

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• The first letter of variable name should be start
  with character
• Eg
• 1num
• _ch
• Variable name can not contain spaces and points
• Eg
• num one
• num.one

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Header files/Prototypes in C
Header files contain the definition of functions
which are used in programming.
includeltstdio.hgt (Preprocessor directive)
stdio (Standard input output)
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• printf()
• This function is use to print the text
  message at the output screen.
• Eg
• printf(Hello and welcome to c program)

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2)scanf() This function is use to scan the
values. Eg int num float x char
ch scanf(d,num) //Here gives
address scanf(f,x) scanf(c,ch) Scanf(
dfc,num,x,ch)
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includeltconio.hgt conio (console
input/output) clrscr() To clear the previous
output screen getch() To print all characters
at the output screen and to hold the output
screen.
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