BASIC source code
BAS is a file extension for a source code file format used by BASIC (Beginners All-purpose Symbolic Instructional Code), an early programming language that is still among the simplest and most popular of programming languages.
Originally designed as an interactive mainframe timesharing language by John Kemeney and Thomas Kurtz in 1963, BASIC became widely used on personal computers everywhere. On IBM's first "family" computer, the PC Jr, a BASIC cartridge was a popular add-on.
Because of its simplicity, BASIC has frequently been used in teaching the introductory concepts of programming with a working language. One popular version of BASIC is QBASIC. Visual Basic adds object-oriented features and a graphical user interface (GUI) to standard BASIC.
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