DECTOP: A TRANSLATOR FOR C TO PASCAL ON DEC-2050

Abstract

In this dissertation an attempt has been made to design and implement a translator for C'-language. C is a general purpose programming language which features economy of expression, modern control flow and data structures,- and a rich set of operators. It is closely associated with ,UNIX system due to which it is very popular-. This translator is implemented in ALGOL on DEC-2050 and uses. its recursion property to advantage. The DECTOP package has three phases-lexical, parsing and translation. The latter two phases are intermingled. The lexical analysis technique used here is matching with fixed tokens and checking of identifiers, and literals. For parsing, recursive descent technique is used and for expressions,, syntax diagrams are used. In this dissertation nearly all operators ,control flow statements, types and input-output statements of C are translated. Among data structures, arrays, functions and structures of C are translated into arrays, functions and records-:respectively of Pascal. DECTOP is a portable translator. It does translation by transliteration!.