Viper 2.08 User's Guide download pdf (Page 18)

II\MERT

by

Robert

Lindley

The

vrP

will

seLect

nine

randon

digits,

one

through

nine,

and

dispray

them.

These

numberi

are

not d.uplicated,

6ach

appears

elactry.once.

Th" _object

of

the

game

is to try

to

get

!-our

line

of

digits

in

order

before

the

vrp

puts

its

rini:

in

drdel.

A

possible

starting

display

might

be:

\

If

you press

key

6,

the

new

display

is:

YOU

nm

As

illustrated,

everything

from the

left

end of the

row

to

the

given

key

number

is

inverted. Al-so

the vrp

seleets

its own

inversion.

The

serectioh

made by the vrp

uses

arl

efficient

algorithm,

but

it

does

not take

full advantage

of

natural

ordero

In

the

case

of a tie

--

you

win.

The

program

was

coded

in

a sirnple

straight

forward

mannerr

The

main

program

is first

and

is mostry

cal-rs

to

subroutines

to

do

the

work. There

is

one

r.mique

thing

in the

program,

it uses a

pai-r

of

subroutines

(sgw

ana nnsrn)

to

save

and

restore

the

memory

poj.nter.

Thi-s

neatly

solves

the

problem

of

using one

poi.nter

for both

data

array

reference

and

display

refererlcer

27936

Br5t+

YoU

27936

Br54

ME

INVERT

639?zBr54

972368r54

INVERT6

/z

/il

6z

'/t+

/6

ilB

ile

dc

ilE

L/

T2

*

76

1B

1A

1C

1E

SIART

r

l,lEXT

I

6Ll.//

--

221E

-r

2266

--

T{z

--

22BB

E-

3\6f,

D-

r2:,/g

-r

22DC

F-

23/2

--.

A3F8

--

n26

--

2376

--

A4gg

--

n26

--

12/6

--

Alll

B

--

LISTING

Sigrral

first

pass

of

game

Do

RNDM

Do

SHINV

Do

SHROIU

Do

WINLS

Test

for

start

new

game

Go to

SIARI

Do

GETIN

Do

S}IR

OI/'I

YOUR

Do

DOINV

Do

MYCHS

MINE

Do DOINV

Go to

NEXT

rEMP

RNDMI

?,o\/og .1

B

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 52 53

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