Sharp PC-1403 - Page 163

157
An in put of 1 print s " FIRST "; 2print s
"S EC OND "; 3 p r in ts " THIRD ".
A ny o t h e r i npu t does not produ ce any
p r int.
10 INPUT A
20 ON A GOSUB 100 , 2 00 , 300
30 END
100 PRINT " FIR S T"
110 RETURN
200 PRINT " SECOND "
210 RE T URN
300 PRINT " THIRD "
310 RETURN
Examples
*'Ml
When th e ON . .. GOSUB verb i s exec uted , the e xpre s s io n b et w een O N and GOSUB
is evaluated and reduc ed t o an i ntege r . If t h e v a lu e o f th e i nt e g er i s 1, t he fi rs t
subroutine i n t he li s t is e x e c u ted as i n a n ormal G O SU B . If t he expressio n is 2, the
second sub ro u ti ne i n the lis t is exec u ted , a n d so f o rth . Aft er the RETURN from the
subroutine , execu t i on pro cee ds w it h th e st ate m ent wh ich foll ows th e ON .. . GOSUB.
If the express i on i s zero , nega t i v e , or l a r ge r t h a n t h e number of su brou ti nes provided
in the list, no subrou ti ne is exec ut ed and exe c ution p roc eed s w it h t h e next line of the
program.
NOTE: Commas canno t be use d i n the e x p r e ss i ons f o l l o wi ng the GOSUB. The
COMPUTER cannot d i sti n g uis h b et w ee n c omm as in e x pressions and com-
mas between e x p re ss io n s.
The ON ... GOSUB ve r b i s u s ed to e x e cu te o n e o f a se t of s ubrou ti ne s de p end i ng on
the v a l ue o f a co nt rol ex p r e ss i on .
Abb r ev i ation s : O . ; G OS. , GO S U .
See a l so : GO S UB , GO TO , O N . . . GOT O
1 ON ex pre ss i on GOSUB express io n li s t
Where : ex p re ssion li s t i s : exp r ess i o n
o r : e xp r es s i o n , e x p r ess i o n ~is t
Verbs
ON ... GOSUB