give introduction of c and ex plane the features of C:

The C programming language was developed by Dennis Ritchie in Bell Telephone Laboratories in the early 1970’s. C has become a language of choice for software professionals.

•    Programs written in C are efficient & fast.
•    Its strength lies in built-in functions which can be used for developing  programs.
•    C is highly portable it means C programs written for one computer can be run on
   another with little or no modification.
•    It is well suited for structured programming. User think of a problem in terms of
   function modules or blocks. A proper collection of these modules would make a
   complete program. It makes program debugging, testing and maintenance easier.
•    C has the ability to extend itself. We can add our own functions to C library.
•    C compiler combines the capabilities of an assembly language with the features of
   high-level languages therefore it is well suited for writing both system software and
   business packages.

The standard for C programs was originally the features set by Dennis M. Ritchie and Brian Kernighan. In order to make the language more internationally acceptable, an international standard was developed, ANSI C (American National Standards Institute).