Sharp PC-1500A Instruction Manual page 27

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3) Special Characters - The S (dollar sign) and the , (comma) have special meanings in BASIC
and may not occur as part o·f a number with in a calculation.
41 Negative Numbers - are denoted by proceeding the number with a - (minus sign} as. for
example: - 5 + 2
=
> -
3
5) Compound Calculations - follow common algebraic laws. Parentheses are used to indicate the
correct meaning of a given expression. Complete inform ation on the order of expression
evaluat ion is given in Appendix 0.
61 Inequal ities - Inequal ities using the symbols
<.
>. <=,
>=,
and
< >
(for less than,
greater than. less than o r equal to, greater than or equal to, and not equal tol will
return~
for
FALSE and 1 for TRUE.
71 Left Arrow key - The Left Arrow key
13]
acts as a non-destructive cursor backspace. Hold ·
ing this key will cause automatic repetition. The Underline cursor changes to a Flashing grid
when placed over a previously typed character. Pressing SHIFT followed by the Left Arrow
key invokes the DE Lete function, which deletes the character on which the cursor is J>Osi·
tioned.
8) Right Arrow key - The Right Arrow key moves the cursor forward non.destructively. Holding
this key down will cause automatic repet ition . The sequence SH IFT, Right Arrow will invoke
the INS.rt Junction; inserting a " place holder" character at the current cursor position. Th is
character can then
be
overwri tten with the information to
be
inserted.
9) Recall function - After ENTER is pressed. and the result of a calculation is d isplayed, the
original equat ion may be "eca lled by pressing either the Loeft Arrow or the Right Arrow key,
At this point, changes may be made and the modified equation re·entered. The Reeall function
will also work for any non-programmed expression which produces an error. In this case, the
cursor will be positioned at the point of error deteetion.
10) The Use of Variables in the RU N mode greatly increases the PC·1500A's computing pawer and
provides brevitY in complex expressions.
11) Assignment Statements using the forms:
variable-n;;ime
=
expression
character-variable-name
=
"characters"
allo w the storage of a single number or a string of up to 16 characters. respectively. Any
printable character may be used within the string except a double q uote.
12) Variable Names for nu meric variables are:
1. A letter (A through Z)
2. A letter followed by a digit {0 through 9 ) o r another letter.
Character variable names follow the same rules with the addition of the
$
(dollar sign) as a
suffix to all names.
131 Exceptions - The following are exceptions to the naming scheme and may not be used as
variable names: IF, LF, LNI, Pl , TO, I FS, LF$, LN$, Pl$, TO$.
14) Life'1pan of Information - Information within variables is r etained until :
1) A CLEAR o r NEW commad is given.
2) A program is run using the RUN command .
3) Another Assignment statement is executed for the same variable.
4) The computer's batteries are changed.
Turning the computer off does not affect values stored in variables.
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