Microsoft marketed two other similar IDEs for C and Pascal, viz QuickC and QuickPascal. Microsoft marketed QuickBASIC as the introductory level for their BASIC Professional Development System. It is loosely based on GW-BASIC but adds user-defined types, improved programming structures, better graphics and disk support and a compiler in addition to the interpreter. QuickBASIC runs mainly on DOS, though there was also a short-lived version for the classic Mac OS. Microsoft QuickBASIC (also QB) is an Integrated Development Environment (or IDE) and compiler for the BASIC programming language that was developed by Microsoft.
