Basic Program

• comments:

         comments can be ignored by the system and they improve readability 

of the program.

              comments are denoted by  /*.........*/

• Header Files:

          Files may contain macros, functions etc... and these functions, 
macros are substituted in the program by  pre processor (#).

          we should include header files in program because to access the functions present in it.

• main()

        Every C program must contain main().

• clrscr()

        clrscr() clears screen data and it is defined in conio.h  file.

     

• printf()

         It is output function which display values on the monitor and 
it is defined in stdio.h file.

• getch()

         getch() reads a character from the keyword  and it is defined in 
conio.h file.

You can also refer

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•   C-Tokens
•   Data-Types
•   Functions
•   Structures