Fundamental of C language programming

Preprocessor directives
   Begins with # symbol
   Provides an instruction to the C preprocessor.
   Preprocessor modifies the text of C program before compilation.
   In the example there are two
–  # include
–  # define
    #incude directive  are used to include some codes in program

Main Function

C program may occur one or more function. Main function  is main part of program. A program can be created  by integrating other sub-functions. We will see funciton subject. we must use {} symbol after main function to enter some code.Thanks to this, we can attain executable program.