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Free and open-source software portal; QB64 (originally QB32) [1] is a self-hosting BASIC compiler for Microsoft Windows, Linux and Mac OS X, designed to be compatible with Microsoft QBasic and QuickBASIC. QB64 is a transpiler to C++, which is integrated with a C++ compiler to provide compilation via C++ code and GCC optimization. [2]
Until MS-DOS 7, MS-DOS Editor and Help required QBasic: the EDIT.COM and HELP.COM programs simply started QBasic in editor and help mode only, and these can also be entered by running QBASIC.EXE with the /EDITOR and /QHELP switches (i.e., command lines QBASIC /EDITOR and QBASIC /QHELP). QBasic came complete with four pre-written example programs.
A subset of QuickBASIC 4.5, named QBasic, was included with MS-DOS 5 and later versions, replacing the GW-BASIC included with previous versions of MS-DOS. Compared to QuickBASIC, QBasic is limited to an interpreter only, lacks a few functions, can only handle programs of a limited size, and lacks support for separate program modules.
QBasic, a version of Microsoft QuickBASIC without the linker to make EXE files, is present in the Windows NT and DOS-Windows 95 streams of operating systems and can be obtained for more recent releases like Windows 7 which do not have them. Prior to DOS 5, the Basic interpreter was GW-Basic. QuickBasic is part of a series of three languages ...
FreeBASIC is a free and open source multiplatform compiler and programming language based on BASIC licensed under the GNU GPL for Microsoft Windows, protected-mode MS-DOS (DOS extender), Linux, FreeBSD and Xbox. The Xbox version is no longer maintained. [2]
QBasic 1.0 was included in MS-DOS 5.0, and in Windows NT 3.x and 4.0. These are three different compiles of the same: 5.00, 5.00a and WNT use different versions of QBASIC. IBM recompiled QBasic and included it in their IBMDOS 5.x, as well as OS/2 2.0 onwards. eComstation includes OS/2, and includes QBasic 1.0. There are four versions of this.
Bill Gates and Paul Allen were working on Altair BASIC in 1975. They were developing the software at Harvard University on a DEC PDP-10 running their Altair emulator. [9] One thing they lacked was code to handle floating-point numbers, required to support calculations with very big and very small numbers, [9] which would be particularly useful for science and engineering.
Starting with Windows 95, MS-DOS Editor became a standalone program because QBasic didn't ship with Windows. The Editor may be used as a substitute for Windows Notepad on Windows 9x, although both are limited to small files only. MS-DOS versions are limited to approximately 300 kB, depending on how much conventional memory is free. [2]