to watch the video on first program on c the link is -https://youtu.be/460Oumb3TYk

1. Welcome to lecture
3……………..
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2. Topics to be covered……….
 Pre-processor directives
 Header files
 Compiler
 comments
 First program in c

3. Pre-processor…………
 A Pre-Processor is a program which
directs the compiler to perform the
particular task or a group of tasks.
 The Pre-Processor directive is a program
which modifies the source file before
handling it to compiler it also includes
conditionial compilation.

4. Available Pre-Processors are…..
 #include
 #define
 #undef
 #if
 #ifdef
 #ifndef
 #error
 __FILE__
 __LINE__
 __DATE__
 __TIME__
 __TIMESTAMP__
 pragma
 # macro operator
 ## macro operator


5. Compiler and Interpreter……….
 A compiler is a program which converts
the program into binary language
(machine language).
 An interpreter also converts a program
into binary language or machine
language.

6. Header files……………
 A header file is a file with extension .h
which contains C function declarations
and macro definitions to be shared
between several source files.
 There are two types of header files: the
files that the programmer writes and the
files that comes with your compiler.

7. Comments ………
 Comments are that part of program which
are not compiled by the compiler or skips
the commented data while changing the
object code into machine code.
 For single line comments we must
include(//).
 For multiline comments we must use(/*-----
*/)

8. To be continued in lecture 4……
//Email us at:umairnsr87@gmail.com
//Contact no:09045562429