Sharp PC-1500 Instruction Manual page 71

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In this
e xal'npfe.
the va ri able I is used to sel ect .. ,.,hich storage location \•Jill hold the result
and i t is also bei ng used to compute the result.
To dcclarn a chJracwr array a slightly dif foreirn form of the DIM statement is used :
DIM character·vari able -narne (size )* length
where :
character ·var iable·name is a variable name \.vh ich conforms to the rules for n ormal character
variables as discussed previously .
~
is t he n u mber of storage locations and must be in the range
0
th rough 255. Note that
when you speci fy a nu 1nber. you get one more location thar-. you specified.
*length is optional . If used. it specifies th e length of each o f the strings that comprise the
array. Length is a number in the r.ange 1 to 80. If th is clause is n ot used. the strings,
will have the default length o f
16
characters.
Examp les o f legal character array declarations
afe :
DIM XS (4)
DIM NM$ (10)
*
10
DIM IN$
11)
*
80
DIM
RS IO)* 26
The fi fSt exa1nple creates an array of five S"tri ngs each able to stofe 16 characters. The second
D IM statement declares an array NM with eleven strings of 10 c haracters each . Expfici.t definition
of StfiHgs smaller than the default hefJ)S to conserve memory space. The third example declares
'a
tw o c lement a rray of BO·ch afacter strings
and
the last example declares
a
single string
of
t\venty·
six characters {see Section B.
I.).
Besides the simple arrays
\~.re
h ave just st udied, t he PC·1500 allo .. vs "t.,,vo·dimcnsional" a rrays.
By analogy. a one·dimensional array is a list o f data arranged in a single column. A two·d imcn·
sional array is
ai
table of dat a with ro\vs and colu mns. The ty.•o ·d imensional array is declared by
the statement :
DIM
numcric ·va ri.:iblc .n amc (fo1;vs, columns)
or
DIM character·v. a riable-n arne (rows, columns) *' length
where :
fOws speci fies the number of rov.rs in the a rray. This must be a number in the range O thfough
255_ Note t hat when you speci fy t:he number of rows you get one more row than the
specification.
colun1ns specifies the nurnber of col umns in the array. This must be a number in the rangt: 0
through 255. Note that .. vhen you specify the numbef of columns you get one more
column than the specification.
The follow in9 diagram illustrates the st orage locat ions that result from the -declaration DI M T
(2. 3) and the subscripts (now composed o f two nu mbers) w hich pertain to each sto rage location :
69
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