C is a programming language developed at “AT & T’s Bell Laboratories” of USA in 1972 and it was developed by Dennis Ritchie. Aim of the c language to design the UNIX operating system (which is used on many computers). C is a powerful programming language than other programming language. C Language spread beyond Bell Labs in very short period. In the late 1970′s C began to replace widespread well-known languages of that time like PL/I, ALGOL etc. Programmers began use C to write all sorts of programs. many organizations began applying their own versions of C with a subtle difference. This was a serious problem for system developers. To solve this issue, the ANSI (American National Standards Institute) formed a committee in 1983 to establish a standard definition of C. ANSI approved a version of C in 1989, which is known as ANSI C. With few suggestions, modern C compiler has the ability to adhere to this standard. ANSI C was then approved in 1990 by the ISO (International Standards Organization)

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