Sharp OZ-707 Operation Manual - Page 25

Defdbl

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Double-precision variables have 20 significant digits and a 2 digit exponent from -99 to 99. Note: Single-character variables to which the sharp mark is appended (e.g. A#) are not fixed numeric variables, but are treated as double-precision simple numeric variables. The following types of variables are stored in separate memory areas: A and AB and X(10) and A# AB# X#(10) Variables can be specified as single-precision (10-significant-digit) variables by appending an exclamation mark ( ! ), or as double-precision (20-significant-digit) variables by the sharp mark (#). However, the Card makes it possible to treat any numeric variable as a single- or double-precision variable by the DEFSNG (define single) and DEFDBl (define double) statements. This is especially useful if your program contains numerous double-precision variables. Storing Values In Double-Precision Variables 1. Using Declarative Signs (I and #) AB! (or AB) = 1234567891234567891234 ~ 1.234567891 x 1021 The value is stored using 10 significant digits in the single-precision variable ABI (or AB). AB# = 1234567891234567891234 ~ 1.2345678912345678912 x 1021 The value is stored using 20 significant digits in the double-precision variable AB#. 2. Using Declarative Signs and Declarative Statements (DEFSNG and DEFDBl) These are two BASIC commands used as variable definition statements. See Chapter 3 for a description of programming. 38 Mixing Double- and Single-Precision Values If a calculation includes double-precision variables, the Card will automatically select double-precision mode where necessary. Double-precision mode is automatically selected in the following cases: Calculations are executed on values containing 11 or more significant digits: Ex. 1234567891234 x 5 The letter D is used in formulas to specify an exponent: Ex. TAN 7.43005 Values are identified using the sharp mark (#): Ex. 4#{l Double-precision variables are used: Ex. AB# + BC The DEFDBl statement is used: Ex. In RUN mode, enter DEFDBL. DBl is highlighted in the MODE CHECK display. DEFDBl IENTER I 51: 191ENTERI DEFDBL 5/ 9 5.55555555555555 55556D-01 If the calculation formula contains a mixture of single- and double-precision values, each individual calculation within the formula is executed according to the degree of precision valid at that time. + 4#{l Single-precision Double-precision Double-precision calculation If double-precision values are converted to single-precision variables, the double-precision value is rounded to 10 significant digits. 39

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Double-precision variables have 20 significant digits and a 2 digit
exponent from
-99
to 99.
Note:
Single-character variables to which the sharp mark is appended (e.g.
A#) are not fixed numeric variables, but are treated as double-precision
simple numeric variables.
The following types of variables are stored in separate memory areas:
A
and
AB
and
X(10)
and
A#
AB#
X#(10)
Variables can
be
specified as single-precision (10-significant-digit)
variables by appending an exclamation mark ( !
),
or as
double-precision (20-significant-digit) variables by the sharp mark
(#)
.
However, the Card makes it possible to treat any numeric variable as a
single-
or
double-precision variable by the DEFSNG (define single) and
DEFDBl
(define double) statements. This is especially useful if your
program contains numerous double-precision variables.
Storing Values In Double-Precision Variables
1. Using Declarative Signs
(I
and #)
AB! (or AB)
=
1234567891234567891234
~
1.234567891 x 10
21
The value is stored using 10 significant digits
in
the single-precision
variable ABI (or AB).
AB#
=
1234567891234567891234
~
1.2345678912345678912
x
10
21
The value is stored using 20 significant digits in the double-precision
variable AB#.
2. Using Declarative Signs and Declarative Statements (DEFSNG and
DEFDBl)
These are two BASIC commands used as variable definition
statements. See Chapter 3 for a description of programming.
38
Mixing Double- and Single-Precision Values
If a calculation includes double-precision variables, the Card will
automatically select double-precision mode where necessary.
Double-precision mode is automatically selected in the following cases:
Calculations are executed on values containing
11
or
more significant
digits:
Ex. 1234567891234
x
5
The letter D is used
in
formulas to specify an exponent:
Ex. TAN 7.43005
Values are identified using the sharp mark (#):
Ex.
4#{l
Double-precision variables are used:
Ex. AB# +
BC
The
DEFDBl
statement is used:
Ex. In RUN mode, enter DEFDBL.
DBl
is highlighted
in
the
MODE CHECK display.
DEFDBl
I
ENTER
I
51:
191ENTERI
DEFDBL
5/ 9
5.55555555555555
55556D-01
If the calculation formula contains a mixture of single- and
double-precision values, each individual calculation within the formula
is
executed according to the degree of precision valid at that time.
+
4#{l
Single-precision
Double-precision
Double-precision calculation
If double-precision values are converted to single-precision variables,
the double-precision value is rounded to 10 significant digits.
39