K-Power_Computer_Space_Adventures.pdf

greetings,Earthling!

Wouldyouliketovisitincredible, distantgalaxies?

Doyouknowhowtosurviveonagrim, desolatemoon?

Didyouevermeetaliensfromfar-offplanets?

Canyouescapefromtheasteroidofdoom?

Withthisbookandyourhomecomputeryou'llbeableto

doallthesethings — andawholelotmore!

JustbesuretoreadourSECRETSOFTHESTARS

beforeyoubegin!

SECRETSOFTHESTARS:

Themissionsupportteamanswersyourquestions

Youmay-betemptedtoskipthissectionandgorighton

totheprograms. Youknowwhatwesaytothat? DON'T!!!

RunningBASICprogramsisfun. Soistypingthemin.

Buttherearetimeswhenprogrammingcanmakeyou

driftoffintospace. Inthissection, we'llgiveyoulotsof

tipstohelpkeepyouoncourse.

Willtheseprogramsrunonmycomputer?

IfyouhaveanIBMPersonalComputerorIBMPCjr, theanswerisYES!

AllyouhavetodoistypeintheProgramListing. Youshouldn'tneedtomake

anychangesatall.

Ifyouhaveanyofthefollowingcomputers, theanswerisstillYES!

AppleII

Apple IIPlus

AppleHe

Atari400,800orXLSeries

ColecoADAM

Commodore64orVIC-20

RadioShackTRS-80ColorComputer

TexasInstruments99/4A

With these computers, you'llusuallyhave tochange the Program List

ingslightly. Mostofthetimeonlyalineortwowillbe different.

Justbe sure toreadthe "IfYou Have..." section thatappearsafter

everyProgram Listing. Italwaystellsyouexactlywhatchangesyou'llneed

tomake foryourcomputer. (TheADAMneedsspecialchanges. Keepreading

tolearnhowtomake them.)

It'sagoodideatoreadthe "IfYouHave..." information beforeyoustart

typinginyourprogram. IfthisisyourowncopyofComputerSpaceAdven

tures, youmaywanttouseapenorpenciltomarkthe ProgramListingwith

the changes you'll need.

There'smoreinformationabouteachofthesecomputersattheendof

thissection. Besuretoreaditbefore startingout!

Ifyou haveanyothercomputer, the answerisstillYES! Butyoumay

have toexperimentuntilyoufindthe exactchangesyourmachine needsto

runeachprogram. Thatshouldbesimple. We'vetriedhardtouseonlythe

partsofBASIC thatare available on mostmachines.

Willmyprogramrunassoonasltypeitin?

Ifaprogramrunsassoonasyoutypeitin, you'reanabsolutelyamaz

ingtypist — andaveryluckyone! Everybodymakeslittletypingmistakes —

evenusexperts! Butinacomputerprogram, littlemistakescancauseBIG

trouble.

Ifaprogram doesn'tseemtorunright, orifyou getanerrormessage —

somethinglike "SyntaxError" or "SN?" or "YouDummy!" — you'llhaveto

gohuntingforyourmistakes. Programmerscallthembugs. Remember, you

putthemthere, andyourprogramwon'trunrightuntilyousquishoutevery

lastone! The official wordforthatis "debugging."

HowdoIgetthebugsoutofmyprogram?

Whenyoutypeinaprogram, youmusttype eachline exactlyasit

appearsinthe listing. Ifyou miss even one space orone comma, yourpro

gramprobablywon'trun thewayitshould.

First, checkyourprogramline bylineagainstthelistinginthebook. It's

agoodideatoLISTonlyafewlinesatatime, usingcommandslike LIST

100-150. Thatway, thewholeLISTwon'tscrollupyourscreenbeforeyou

getachanceto read it.

You'llprobablyslap yourheadwhenyou discovertheidiotic goofsyou

made. With some computers, you'll have to typethewhole line inagainto

makeacorrection. With others, youcanjusttype inthe changes. Learn

whichwayyourcomputerworks: It'llsaveyoulotsoftyping.

Second, be sure you've made the changesyourparticularmachine

needs. Alwayslookatthe "IfYou Have. . ." sectionforyourparticular

computer.

Ifyourprogramstill doesn'trun, don'tgiveup! Thereareplentyof

thingsyoumayhavedonewrong. Howdoweknow?Becausewedothem

allthe time ourselves! Here aresome thingstoWatchoutfor:

RottenLeftovers

Whenyoustarttypinginaprogram, besure to type NEWandhitthe

ENTER (orRETURN) key. Ifyou don't, you mayfindleftoverlinesfroman

oldprogrampoppingup in yournewone. Itcanbearealmesstoget

them out!

TheCurseoftheMissingLineNumber

It'seasytoskip alinebyaccidentwhenyou'retypingalongprogram.

Remember: Everyprogram in thisbookincludesaREMstatementonline

10with thenameoftheprogram. Thenextline ineveryprogramisline 100,

andthelinescountupbytensfromthere, likethis:

10 REM USELESS PROGRAM

100 INPUT X

., 110 INPUT Y

120 PRINT Z

Theonlyline numbersthatwon'tendin0willbelinesyouaddfromthe

"IfYouHave..." section. Andtheonlytimethelineswillskip — sayfrom

240to 260 — iswhenthe "IfYouHave..." sectiontellsyoutoremovealine

foryourmachine.

OneOutofRvo

Some thingshave to come inpairs, oryourcomputerwill getterribly

upset. Whatkindsofthings? Mainly quotationmarks ("") andleftandright

parentheses(()). Leavingone outisjustaboutguaranteedtogetyousome

sortoferrormessage. That'swhyit'simportantto checkastatementlike

300 PRINT CHR$(INT(RND(l)*(3+2)/(4+3)))

verycarefully. Ifyou're notpositive, counttheparenthesesandquotation

marksonyourotherpersonal computer — yourfingers!

ALetter'sNotaNumber

Yourcomputerisvery, veryfussyaboutlettersandnumbers. Remem

ber, aone (1) isnotasmallL (1) oracapitali (I), eventhoughtheymaylook

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