Sharp OZ-707 Operation Manual - Page 15

To

change

the

sign

of

the

previous result,

mU_lti..:...p..;..ly-b-

y

---1-:------,

[K]

G

1

I

ENTER

I

31313*1513

Using Variables in Calculations

45131313*.15

67513*-1

45131313

6751.3

-67513

The

Card

can

store up

to

26

simple numeric variables under

the

alphabetic characters A

to

Z.

If

you

are unfamiliar

with

the concept of

variables, they are

more

fully explained

in

Chapter

2.

Variables

are

designated

with

an

assignment statement:

A=sIENTER!

B

=

-2

I

ENTER

I

You

can

also

assign the

value

of

one variable (right)

to

another

variable (left).

C

=

A

+

3

I

ENTER

I

D

=

C

I

ENTER

I

As

you

press

I

ENTER!

,

the

Card

performs

the

calculation

and

displays

the

new

value

of

the variable.

You

can

display

the

current

value

of

any

variable

by

entering

the

alphabetiC

character it

is

stored under:

1

....

1

C

I

EHlER

I

I

c

8

I

Variables will retain their

assigned

values

even

if the Organizer

is

turned

OFF

or undergoes

an

Auto

OFF. Variables

are

lost only

when:

•

You

assign

a new value

to

the

same variable.

•

You

enter

CLEAR

I

ENTER

I

(not

the

I

C.cE

I

key).

18

There

are

certain limitations

on

the

assignment

of

variables,

and

certain

programming

procedures that cause

them

to

be

changed.

See

Chapter 2 for a discussion

of

assignment.

See

Chapter 2 for a

discussion

of

the

use

of

variables

in

programming.

Single-Precision, Double-Precision

The

largest number that the

Card

can

handle

in

the

single-precision

mode

is

ten

significant digits,

with

a

twO-digit

exponent.

In

the double-precision

mode,

it

is

increased

to

20

significant digits

(the

capital

E,

indicating

the

exponent,

is

replaced

by

a capital D

in

double-precision

mode).

Selecting Double-Precision Mode

1.

Enter

RUN

mode

and

press

the

I

C.cE

I

key

to

clear

the

display.

2.

Enter DEFDBl

and

press

the

I

ENTER

I

key.

DBl

is

hi

hlighted

on

the

MODE

CHECK display (press

MODE

CHECK

).

indicating that

the

Card

is

now

in

the

double-precision

mode.

Although

the

exponent

is

indicated

by

a capital letter D

in

the

double-precision

mode,

you

can

still

use

either

the

E

or

D

as

a

character

when

entering the exponent

in

an

expression.

See

page

39

for more details.

Canceling Double-Precision Mode

1.

In

the

RUN

mode,

press

the

I

CeCE!

key

to clear

the

display.

2.

Enter

DEFSNG

and

press

the

I

ENTER!

key.

SNG

is

highlighted

on

the

MODE

CHECK display, indicating that

the

Card

is

now

in

the single-precision mode.

The

double-precision

mode

is

automatically

canceled

if:

1.

The

power

is

turned

OFF.

2.

The

RUN.

NEW or

CLEAR

command

is

executed.

Last Answer Feature

In

a simple calculation, the result

of

the previous calculation

can

only

be

used

in

continuous calculations

as

the first

number.

19

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Sharp OZ-707 Operation Manual - Page 15

Using Variables in Calculations, Single-Precision, Double-Precision, Last Answer Feature

Page 15 highlights