Remote Processing BASIC 52 - Manual (Page 63)

RPBASIC-52 PROGRAMMING GUIDE
2-44
GOSUB
Syntax: G O S U B line number
...
line number program state ments
R E T U R N
Function: Transfers program control to the specified line number. The RETURN causes execution to resume at
t h e p r og r am s t at e m e nt a ft e r G O S U B .
Mode: Run
Use: 1 0 0 FO R A = 1 to 2 0 : G O S U B 2 0 0 : N E X T A : E N D
2 0 0 PR I N T A , S Q R ( A ) : R E T U R N
Cards: All
D E S C R IP T I ON
GOSUB provides subroutine capability within RPBASIC-52 programs. A subroutine may be called from
within another subroutine.
GOS UB sav es the location of the program state ment after G OSU B on the C -Stack and im mediately transfers
program control to line number. When a RETURN is encountered, program execution resumes at program
s t at e m e nt a ft e r G O S U B .
GOSUB s can be nested. The number nesting is limited by available C-Stack RAM, but is usually enough for
at least 30 routines.
RELATED
G O T O , O N -G O T O , O N -G O S U B
E R R O R
C - S T A C K An unexpected RETURN is encountered or the number of subroutines executed was excessive.
EXAMPLE
10 GOSUB 100
20 PRINT "Back from routine"
30 END
100 PRINT "In subroutine"
110 RETURN
>run
In subroutine
Back from routine