Definition(en): A source code file written in B programming language developed in the late 1960s as a derivation from BCPL (Basic Combined Programming Language) and having been superseded by the C language. B is a so-called typeless language, i.e. a programming language with the only data type being the computer word treated either as an integer or a memory address to be dereferenced, depending on the context, or more precisely on how the word is processed.