Sharp PC-1500A Instruction Manual page 85

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PRINT USING
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......
..
-
-, ;;: ;;: ;;: '
= = = "' ;
246813
2 4 6. 8 1 3
I
Note : Use th e number o f
~
{including
*
I marks fo r variab le (in teger) designation in the
following range:
With a 3·digit punctuation ( ,) not used: Within 11 (including sign)
With a 3-0iglt punctuation
(,I
used: Withi n 14 (including sign)
Th is computer has 1 O significant digits for the numbers.
When the format exceeding 10 integers is designated by the USING statement a nd
the figure exceeding 10 integers is displayed (pr inted) by the PRINT {LPRINT)
statement, the
displayed (printed) number may be incorreet.
Example: RUN mode Display
US I NG'·~#
::t
~:;:::;:,::::::
:: :: :;:
~
.. IENT£RI -.
>
PR INT 888888888888 l<• n•l
( LP RIN T 888888888888
1•••••1
12 d igits
E. Computed Control Transfer
- 888888888800
-+
88888888880 )
In addition to the basic control statements described in Chapter Ill. the PC·1500A provides two
other control statements of great utility. These are the ON GOSUB and the ON GOTO. As you
m ight guess from their names, these sta tements act like the GOSUB a nd GOTO statemen ts
discussed previous ly . The difference, howeve r, lies in their abili ty to transfer con trol (i.e. to
execute statements at
a
different location) auto matically. That is, the GOTO or GOSUB fu nctions
will "GO" to one ot several statements {or subrou tines) depending on the value of a numeric
variable. This dependence on a variable for guidance is what gives the ON state"'ents the
nickname .. computed control
statements".
The ON statements have the form:
ON expression
l
GOTO
GOSUB
line
ii
1. line ll2, line 113, . . . (etc)
T he exp(essiol'I which follows the ON keywo(cJ must evalua te to a positive integer greater than
zero and less t h an the number of line·numbers listed after the GOTO or GOSUB keyword. Our ing
execution,
when t he
computer encounters an ON statement. it transfers the flow or execution to
the line.number which corresponds to the value of the expression.
A typical ON statement might be:
ON
TX GOSUB 100, 200,
250. 300
In this case. the variable TX MUST contain a number in the range 1 through 4 because th•lre are
only four line-numbers listed . Any other number in TX will result in an error since there is no
corresponding line·number. For this reason, it is important t o include sufficient tests (IF state·
ments) to insure that your expressions result in a valid number.
The ON statements arc very useful for automating a series of choices. For example. consider
the following program fragment whid:i allows the user to select one of several tax tables. Without
the ON statement this migit be written:
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