RETURN
Revision as of 22:59, 15 October 2012 by imported>Clippy
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
it went here.
See also:
