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

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demonstration on how to set up a table on the videodisplay.Subroutine lines 900 and 910 generate randomnumbers in the range of zero to 99. Lines 60 and 70 findhow many times through the random number generator ittakes to get a number greater than 50. The answer isstored in A.Lines 90and 100 do it again and store the answer inB.Line 40 prints the table heading and line 110 displaysthe results.Program Listing5 RAND10 LET A='120 LET B='130 LET T='140 PRINT CHR$ 166,CBR$ 16750 GOSUB 90060 IF X>50 THEN LET A=A+l70 IF X>50 THEN GOTO 5080 GOSUB 90090 IF X>SO THEN LET B=B+l100 IF X>50 THEN GOTO 80110 PRINT A,B120 IF T=lO THEN STOP130 LET A='1140 LET B='1150 LET T=T+l160 GOTO 20900 LET X=INT(lOO*RND)910 RETURN85 Go To BlackThere are ways to black-out your screen without goingto the graphics mode. Line 150 is a freeze-frame.106
Program Listing10 CLS100 FOR L=g TO 21110 FOR C=g TO 31120 PRINT AT L,C:CHR$ 128130 NEXT c140 NEXT L150 GOTO 15086 Centered MessageThink up a message of up to 20 characters andspaces. Type it into your TIMEX in response to the requesthere at line 110.The computer will highlight your message by centeringit on the video screen.Use this handy centering program for titles and otherimportant parts of longer programs. It makes a goodsubroutine.Program Listing10 LET A$=nn100 PRINT nMESSAGE:"110 INPUT M$200 LET L=LEN M$210 LET T=L+4220 FOR Z=l TO T230 LET A$=A$+n*n240 NEXT Z250 LET P=(40-T)/2260 CLS300 PRINT TAB P:A$310 PRINT TAB P:n* n:M$:n *n320 PRINT TAB P:A$107
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IMEX/ SJ,NCLAIRODO zx-B'IRDGRAMMING
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FIRST EDITIONFIRST PRINTING©1983 b
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TipTable of ContentsPageIntroductio
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Gee Whiz37 Gee Whiz I: Smart Adder
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97 Draw A Line98 Box Message99 Boxe
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The 101 programs in this handbook c
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author's training in writing BASIC-
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Fun & Games
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Program Listing10 RAND100 LET A=INT
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140 IF R
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130 PRINT •BACKWARD:•140 FOR J=
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110 PRINT •PRESS ANY KEY TO PLAY
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12 60-Second TimerA one-minute time
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210 IF A$=•• 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
Page 58 and 59: 38 Gee Whiz II:Three-Digit MysteryH
Page 60 and 61: 41 Gee Whiz V: SecondAlphabet Spott
Page 63: Number Crunching
Page 66 and 67: 120 LET R::R+l125 LET W=j130 LET Z=
Page 68 and 69: 10 the computer asks for a number.
Page 70 and 71: Program Listing10 PRINT •WHAT IS
Page 72 and 73: 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=$0.08KELL
Page 93 and 94: ending in 95 cents. For instance, a
Page 95 and 96: 100 LET D=l-0.0l*P110 LET R=W/D120
Page 97 and 98: 100 IF H>40 THEN GOTO 140110 LET W=
Page 99 and 100: Unit price is total price divided b
Page 101: The computer generates a table of r
Page 105 and 106: 80 Screen FullFill your video scree
Page 107: gram lines to draw and seem to move
Page 111 and 112: There are a number of ways to get t
Page 113 and 114: 140 NEXT X200 LET X=INT(63*RND}210
Page 115 and 116: Program Listing10 LET A$=• 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 and 124: Appendix A:Sinclair BASIC WordsHere
Page 125: StatementsCLEARCLSCONTCOPYDIMDIM $F
Page 129 and 130: ooks from ARCsoft PublishersFor the
Page 132: 101 TIMEX 1000/Sinclair ZX-81Progra
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