RETURN

From QB64 Phoenix Edition Wiki
Revision as of 02:17, 24 January 2023 by RhoSigma (talk | contribs)
Jump to navigation Jump to search

RETURN is used in GOSUB procedures to return to the original call code line or a specified line label.


Syntax

RETURN [{linelabel|linenumber}]


Parameters

  • RETURN without parameters returns to the code immediately following the original GOSUB call.
  • line number or linelabel after the RETURN statement returns code execution to that label.


Usage:

  • Normally required at the end of a GOSUB procedure unless the procedure returns using a loop.
  • RETURN is not used in error handling procedures. Error procedures use RESUME line number or RESUME NEXT.
  • GOSUB procedures use line numbers or line labels designated with a colon after the number or label.
  • If RETURN is encountered without a previous GOSUB call a "RETURN without GOSUB" error is produced.
  • To avoid errors, place GOSUB procedures AFTER the main program code END or after an EXIT SUB or EXIT FUNCTION call.


Example 1: Returns after a Gosub.

FOR a = 1 TO 10
PRINT a
IF a = 5 THEN GOSUB five
NEXT
END       'END or SYSTEM stop the program before the execution of a sub procedure

five:
PRINT "Aha! Five!"
RETURN
 1
 2
 3
 4
 5
Aha! Five!
 6
 7
 8
 9
 10


Example 2: Returns to a specific line label.

GOSUB hey
PRINT "it didn't go here."
hoho:
PRINT "it went here."
END

hey:
RETURN hoho
Code by Cyperium
it went here.



See also:



Navigation:
Main Page with Articles and Tutorials
Keyword Reference - Alphabetical
Keyword Reference - By usage
Report a broken link