Editing PowerBASIC (section)

===Turbo Basic===
Borland's Turbo Basic contains extensions to classic BASIC (without breaking compatibility), such as a drawing API and mouse access.

Unlike most BASIC implementations of its time, Turbo Basic was a full [[compiler]] which generated native code for MS-DOS. Other implementations were either [[BASIC interpreter|interpreters]], or relied heavily on a [[runtime library]]. The integrated development environment could run a BASIC program internally for traditional BASIC debugging (see sample below), or generate an MS-DOS stand-alone [[.exe|executable file]] that could be run on other systems without the Turbo Basic product or runtime libraries.

====Code example====
<!-- Deleted image removed: [[File:Turbobasic11 01.png|thumb|Turbo Basic 1.1 editing the example code, in the zoomed editor window.]] --><!-- Deleted image removed: [[File:Turbobasic11 02.png|thumb|Turbo Basic 1.1 running the example in the multiple-window IDE.]] -->
The following program is an example of the [[ALGOL]]-like BASIC dialect that Turbo Basic supported. Unlike traditional BASIC,{{citation needed|date=February 2018}} which used line numbers and had limited control structures and no support for ALGOL-like subroutines, modern BASIC dialects starting at this period were extended to make the language compatible with modern [[structured programming]] style by making line numbers optional and adding the control structures and subroutine definitions needed for structured programming.

<syntaxhighlight lang="qbasic">
INPUT "What is your name?: ", n$
PRINT "Hello "; n$
DO
  s$ = ""
  INPUT "How many stars do you want to print"; s
  FOR i = 1 TO s
    s$ = s$ + "*"
  NEXT i
  PRINT s$
  DO
    INPUT "Do you want to print more stars"; q$
  LOOP WHILE LEN(q$) = 0
  q$ = LCASE$(LEFT$(q$, 1))
LOOP WHILE q$ = "y"
PRINT "Goodbye "; n$
</syntaxhighlight>

(<code>s$</code> is a [[string (computer science)|string]] and <code>s</code> is a [[single-precision floating-point format|single-precision floating-point]] (number). They are separate variables.)

Like the other Borland products of this era, the code executes within the integrated development environment.