Sharp PC-1500 - Page 71

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In this exal'npfe. the va riable I is used to select .. ,., hi ch storage loca ti on \•Jill hold the result
and it is also being used to compute the resu lt.
To dccl arn a chJra cw r array a s li ght ly di fforeirn form of t he DIM stat eme nt is u sed :
DIM cha rac te r·v a ri ab le- na rne (s iz e )* l ength
where:
cha racter ·variable·na me is a v ar iable name \.v hi ch con f orms to the ru l es f or n orma l charact er
var iable s as discussed pr ev i ous ly .
~ is the nu mber of storage l ocat io ns and mus t be in the ran ge 0 th ro ug h 2 55 . No te that
when you speci fy a nu 1nbe r. yo u get one more lo cat ion tha r-. yo u specified.
*len g th is optional . If used. it specifies th e l ength of each of the strings that com pri se the
array. Le ngth is a num ber in t he r.ange 1 to 80. If this clause is n ot used. the st ring s,
will have the defau lt length o f 16 characters.
Examples of leg al c har acter array decla rati ons afe :
DIM XS ( 4)
DIM N M$ (10) * 10
DIM I N$ 11) * 80
DIM RS IO)* 26
The fi fSt exa 1n ple creates an array of five S"t rin gs each ab le to stofe 16 cha r acters . The se cond
DIM stateme nt de clar es an array NM with ele ven str ings of 10 ch ara cte rs each . Exp fici.t def ini tion
of StfiH gs smalle r tha n the default he fJ )S to conse rve memory sp ace . The th i rd example dec lares
'a two cl emen t arr ay of BO ·ch afacter st rings a nd the last ex amp le decl ar es a single str ing of t\vent y·
six cha r acters {se e Section B. I.).
Bes id es the simpl e arrays \~ .re have ju st st udied, t he PC·1500 allo .. vs "t.,,vo· dimc nsi ona l" arr ays .
By
ana l ogy . a on e·di men siona l array is a list of data arranged in a single co l umn. A two ·d i mcn·
siona l arra y is ai table of da ta with ro\vs and col u mns. The ty. •o ·di mens i ona l array is dec lar ed by
the st a temen t :
DIM numcr ic· va ri .:iblc.namc (fo1;vs , co lumns)
or
DIM cha r acter·v .ariable-nar ne (rows, column s) *' l engt h
w he re:
fOws specifies the n umbe r of rov.rs in the arr ay. This must be a n umbe r in the range O thfough
255_ Note t hat when you speci fy t:he numbe r of ro ws you get one more r ow than the
spe ci ficati on .
co lun 1n s spec ifies the nurnber of col um ns in t he array. This m us t be a nu mbe r in th e rang t: 0
t hro ugh 2 55 . Not e that .. vhen you specify the numbef of columns yo u get on e mo re
co l umn than the specif i cation.
The follo w in9 diagram ill ustrates the storage lo cat io ns that res ult from the -decla ration DI M T
(2. 3) and the s ubscripts (now compo sed of two nu mb ers) w hic h pe rtain to each stor age l ocatio n :
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