C has become one of the most frequently used computer languages. The first C language was developed by Dennis Ritchie at Bell Laboratories in 1972 and ran on a DEC PDP-11. The ANSI standard for C, which replaced the standard written by Kernighan and Ritchie in 1978, is only a few years old. Cís structure is similar to PL/I (a popular language used on IBMís mainframe computers), FORTRAN, Pascal, and BASIC. C is a simple language. It has only a small group of keywords and no support for I/O or advanced math. The power of C comes from its simplicity and its use of a standard library of functions.