C language introduction

C is the most popular computer programming language or compiler language developed by the Dennis richly in New Jersey between 1969 to 1973 at bell telephone laboratories actually c re-implement with the UNIX (operating system) but after  UNIX OS also re-written in C.The language was formatted in 1988 by ANSI (American national standard institute).the aim of the c language is to provide an easy and natural way of giving programs of instruction to a computer

FEATURES:

                 Nowadays C widely using as Professional language to write program(s) so we have known what are the reasons there

      Easy to WRITE

      Easy to LEARN

      STRUCTURE PROGRAM
  
      EASY TO DEBUGGING & TESTING & MAINTENANCE

      ITS  ALLOWS VARIETY OF PROGRAMS 
  
      It can produce EFFICIENT PROGRAM

      It is many time faster than BASIC
Include header file section
Global declaration section
main( )
{
Declaration part
Executable part
}
User-defined functions
}
Statements
}

 Include header file section 

c program depends upon some header files for function definition that are used in the program. every header file consists .h. example: #include 
   use of header file:
       It is declared interface of parts of operating system and also
       It is also useful for copying source which you have to want

 Global declaration 

 

      This section declares some variables that are used in more than one function. These variables are known ad global variables.This section must be declared outside of all the functions.

Function  main

 

Every program contain main() function.The main() is stating of every c program.
 Note: without main() we cannot execute the c program 

Declaration Part 

 

  The declaration part declares the entire variables that are used in execution part



User-defined

 #Includen

 includes any file code to our program so program studio.h code will be added

Clrscr ()

It is predefined function which is clear previous output an console

Printf

 It is predefined function to something on console

scarf

It is predefined function which takes I/p from keyboard & stores in RAM

getch()


 It is also a predefined function which reads characters so that program execution will not complete until we press any key
    

          IT IS HELPFUL FOR   IN WRITING C PROGRAMS 

<DIR         > Directory  Views.

<CD            >Displays/changes the current directory.

<CLS          >Clear screen.

<COPY       >Copy files.

<DEL         >Removes one or more files.

<EXIT      > Exit from the shell.

<MD         >Make Directory.

<RD         >Remove Directory.

<REN       >Renames one or more files.

<TYPE     >Display the contents of a text DOS version.

<VER      >View and set the reported DOS version


THIS KEYS ARE USEFUL FOR ADJUSTING

ALT-ENTER  :   Go full screen and back.

ALT-PAUSE    :  Pasuse DOSBox.

CTRL-F1       :   Start the key maker

CTRL_F4      : Upadate directory cache for all drives!swap mount disk-image.

CTRL-ALT-F5  :  Start/Stop creating a movie of the screen.

CTRL-F5     :  Save a screenshot.

CTRL-F6    :  Start/Stop recording sound output to a wave file.

CTRL -ALT-F7 : Start/Stop recording of OPL commands.

CTRL-ALT-F8  : Start/Stop recording of raw MIDi commands.

CTRL -F7    :  Decrease frameskip.

CTRL -F8    : Increase frameskip. 

CTRL -F9     : Kill DOSBox.

CTRL-F10    : Capture/Release the mouse.

CTRL-F11   : Slow down emulation (Decrease DOSBox Cycles).

CTRL-F12   : Speed up emulation (increase DOSBox Cycles).

ALT-F12      : Unlock speed (turbo button/fast forward).




  HOW TO OPEN C THROUGH COMMAND PROMPT



<\center> To write C language we need compiler to run our program.

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