page-1983-101-timex-sinclair-programming-tricks

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FunctionsABS absolute value of a numberACS arccosineAND logical ANDASN arcsineATN arctangentCHR$ changes 0 to 255 number to a characterCODE number of first character in a stringcos cosineEXP exponentINKEY$ scans keyboardINT integer part of numberLEN length of a stringLN natural logarithmNOT logical NOTOR logical ORPEEK look at one memory-address locationPl 3.14159265RND random-number generatorSGN sign of a numberSIN sineSOR square rootSTR$ change numerical value to stringTAN tangentUSR call machine-language routineVAL change string to number+ addition of number or stringssubtraction* multiplicationdivision** raising to a power= equals> greater than< less than>= less than or equal to
StatementsCLEARCLSCONTCOPYDIMDIM $FASTFORGOSUBGOTOIFINPUTLETLISTLUSTLOADLPRINTNEWNEXTPAUSEPLOTPOKEPRINTRANDREMRETURNRUNSAVESCROLLSLOWSTEPSTOPTABTHENTOUN PLOTclears variablesclears screencontinue after STOPcopy TV screen on printerdimensions numerical arraydimensions string arraystarts fast mode of TV displayfirst part of FOR/NEXT loopjump to subroutinejump to a linefirst part of IF/THEN decision makerstops so data can be enteredassigns a value to a variabledisplays program list on TV screendisplays program list on printertransfers program from tape into computerPRINT on printererases all of program memory and variableslast part of FOR/NEXT loopholds TV display on for brief delayblacks in a graphics-screen dotwrites in one memory-address locationdisplays on TV screenreseeds random-number generatorstatement ignored during runend of GOSUB, jump back to main routineclears variables and starts program actionrecords program from computer onto taperolls TV display up a lineswitches to slower display modeoptional part of FOR/NEXT looptemporary halt in a runPRINT at a certain place on TV displaylast part of IF/TH EN decision makerfollows FOR in FOR/NEXT loopblanks out a graphics-screen dot123
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IMEX/ SJ,NCLAIRODO zx-B'IRDGRAMMING
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FIRST EDITIONFIRST PRINTING©1983 b
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TipTable of ContentsPageIntroductio
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Gee Whiz37 Gee Whiz I: Smart Adder
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97 Draw A Line98 Box Message99 Boxe
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The 101 programs in this handbook c
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author's training in writing BASIC-
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Fun & Games
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Program Listing10 RAND100 LET A=INT
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140 IF R
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130 PRINT •BACKWARD:•140 FOR J=
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110 PRINT •PRESS ANY KEY TO PLAY
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12 60-Second TimerA one-minute time
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210 IF A$=•• THEN GOTO 200220 I
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convert those raw numbers to a batt
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The program here has a temporary su
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1 Create a QuizOne of the most fasc
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line 10 for a.word. It is looking f
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program if you. don't get it right
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90 PRINT100 PRINT "ADDRESS";TAB lO;
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160 LET D$(7)=•sEE YOUR ANALYST"1
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32 Sentence WriterPractice your Eng
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160 IF GH THEN LET H=G180 GOTO 2020
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30 PRINT A$;40 GOTO 1036 Question &
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Gee Whiz
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38 Gee Whiz II:Three-Digit MysteryH
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41 Gee Whiz V: SecondAlphabet Spott
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Number Crunching
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120 LET R::R+l125 LET W=j130 LET Z=
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10 the computer asks for a number.
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Program Listing10 PRINT •WHAT IS
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25 INPUT Z30 IF Z=I THEN GOTO 8035
Page 74 and 75: 70 GOTO 2080 CLS90 PRINT "THE SMALL
Page 76 and 77: 60 CLS70 PRINT "THE FRACTIONAL PORT
Page 78 and 79: 30 INPUT N35 IF N>INT N THEN GOTO 5
Page 80 and 81: Line 20 generates the numbers. Line
Page 82 and 83: Random Numbers:Distr~butionEver won
Page 84 and 85: 110 PRINT "RANDOM NUMBERS TOTAL ";T
Page 87 and 88: Money Matters
Page 89 and 90: Shopper's FriendTake your computer
Page 91 and 92: POST IS BEST BUYPOST UNIT=$0.08KELL
Page 93 and 94: ending in 95 cents. For instance, a
Page 95 and 96: 100 LET D=l-0.0l*P110 LET R=W/D120
Page 97 and 98: 100 IF H>40 THEN GOTO 140110 LET W=
Page 99 and 100: Unit price is total price divided b
Page 101: The computer generates a table of r
Page 105 and 106: 80 Screen FullFill your video scree
Page 107 and 108: gram lines to draw and seem to move
Page 109 and 110: Program Listing10 CLS100 FOR L=g TO
Page 111 and 112: There are a number of ways to get t
Page 113 and 114: 140 NEXT X200 LET X=INT(63*RND}210
Page 115 and 116: Program Listing10 LET A$=• 1120 F
Page 117 and 118: 100 FOR Y=l5 TO 25 STEP 10110 FOR X
Page 119: 101 Random Bar GraphIf you don't ha
Page 123: Appendix A:Sinclair BASIC WordsHere
Page 129 and 130: ooks from ARCsoft PublishersFor the
Page 132: 101 TIMEX 1000/Sinclair ZX-81Progra
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