Although C is made to program computer systems and networks, this language is also often used in developing application software. C is also widely used by various types of operating system platforms and computer architecture, even some very popular compilers are available. C amazingly influences other popular languages, especially C++ which is the extension of C.
In 1978, Dennis Ritchie and Brian Kernighan published the first edition of a book entitled The C Programming Language. This book has until now been recognized as a C language scripture and is the main reference for programmers who want to know about C language, mainly because of the complete scope of this book about C language and the ease with which the program is exemplified in this book. The C language version featured in this book was later recognized in programmers as CK&R. In the book The C Programming Language Second Edition then covers ANSI C that was introduced later.