C is programming language that was create by Dennis Ritchie at AT&T Bell Labs in 1972. It was first implemented on a DEC PDP-11 computer running the UNIX operating system. The name and language was derived from BCPL. C is a high level programming language. Functions are the building blocks of C programs. The language contains a set of standard C library functions. It is an extensiable language by allowing the software programmer to create their own functions.