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| '''GOSUB''' is a command in many versions of the ] computer ]. A GOSUB statement jumps to a line elsewhere in the program. That line and the following lines up to a ] are used as a simple kind of a ] without (sometimes with) parameters or local ]. | |||
| ⚫ | ] | ||
| {{R from subtopic}} | |||
| The GOSUB command may be used to emulate ] in a BASIC dialect that does not support functions in its syntax. GOSUB is convenient for performing the same function several times in a BASIC program without duplicating the code.<ref>{{cite web|url=http://www.qbasicnews.com/qboho/qckadvr.gosubr.shtml|title=GOSUB...RETURN Statement Details.|date=1988|accessdate=2008-07-04|author=|publisher=]}}</ref> | |||
| {{Rwh}} | |||
| == RETURN == | |||
| A ] command resumes ] from the point at which GOSUB was invoked. | |||
| Using GOSUB too many times, as in a loop or recursively, without corresponding RETURN statements, would typically cause a ]. On the other hand, when the BASIC interpreter encounters a RETURN statement without a GOSUB it will emit a <code>RETURN WITHOUT GOSUB</code> error. | |||
| == Computed GOSUB == | |||
| A computed GOSUB statement, <code>ON...GOSUB</code>, exists in some BASIC dialects. The syntax of the statement is <code>ON x GOSUB line1, line2, ...</code> Computed GOSUB branches to one of several destinations based on the value of x. RETURN commands return program flow to the statement following ON..GOSUB. | |||
| == Support == | |||
| Not all BASIC implementations support GOSUB or ON..GOSUB. For example, in ] GOSUB is considered as deprecated in favor of ]/FUNCTION, and is disabled by default.<ref>{{cite web |url=http://www.freebasic.net/wikka.php?wakka=KeyPgGosub |title=GOSUB |date=2008-05-08 |accessdate=2008-07-04 |publisher=FBWiki |quote=Gosub support is disabled by default in the -lang fblite unless the Option Gosub statement is used.}}</ref> In ], GOSUB and ON..GOSUB were removed when ] was released. | |||
| ==See also== | |||
| * ] | |||
| ==References== | |||
| {{reflist}} | |||
| ⚫ | ] | ||
| {{compu-lang-stub}} | |||
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