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

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120 LET R::R+l125 LET W=j130 LET Z=ll*Z135 PRINT R;n RIGHT SO FARn140 GOTO 30145 PRINT nyou HAD •;R;n RIGHTn150 PRINT •LETS START OVER"155 GOTO 1044 Number Reverser IThis program generates a series of random numbersand then adds them up. Then it reverses the order of thedigits in the total. Creates a very strange random number!Lines 20-40 generate three random single-digitnumbers. Line 50 is a trap to make sure they are between1 and 9 with no zeros showing up.Line 60 changes the number values into strings sothey can be tied together as three digits at line 75'. Line 85takes those three-digit strings from line 75 and turns themback into numerical values.Line 10 5, is a time delay loop to stall a moment beforeline 110 pushes action back up to line 10 for a new start.Program Listing10 CLS20 LET J=INT(lO*RND)30 LET K=INT(lO*RND)40 LET L=INT(lO*RND)50 IF J
100 PRINT •BACKWARD, IT IS •;R105 PAUSE 200110 GOTO 10l45 Number Reverser IIGive the computer a number. It will immediately,display the number printed backward on the videodisplay.Line 20 collects the number from you. Line 30measures its length. Lines 40-70 reverse it and line 80displays the reversed number.Program Listing10 LET B$= 0 •20 PRINT 0 GIVE ME A NUMBER •;25 INPUT N$30 LET L=LEN N$35 PRINT N$40 FOR Y=L TO 1 STEP -150 LET B$=B$+N$(Y)60 NEXT Y70 LET B=VAL B$80 PRINT 0 REVERSED, THE NUMBER IS •;B90 PRINT100 GOTO 1046 Number-Error TrappingGood programs, those which are well written, neederror trapping. It's a technique for making sure personscommunicating with the computer don't key in inappropriatedata or make mistakes which would cause computationproblems for the computer.For instance, see the example program here. In line65
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IMEX/ SJ,NCLAIRODO zx-B'IRDGRAMMING
Page 6 and 7:
FIRST EDITIONFIRST PRINTING©1983 b
Page 8 and 9:
TipTable of ContentsPageIntroductio
Page 10 and 11:
Gee Whiz37 Gee Whiz I: Smart Adder
Page 12 and 13:
97 Draw A Line98 Box Message99 Boxe
Page 14 and 15:
The 101 programs in this handbook c
Page 16 and 17: author's training in writing BASIC-
Page 19 and 20: Fun & Games
Page 21 and 22: Program Listing10 RAND100 LET A=INT
Page 23 and 24: 140 IF R
Page 25 and 26: 130 PRINT •BACKWARD:•140 FOR J=
Page 27 and 28: 110 PRINT •PRESS ANY KEY TO PLAY
Page 29 and 30: 12 60-Second TimerA one-minute time
Page 31 and 32: 210 IF A$=•• THEN GOTO 200220 I
Page 33 and 34: convert those raw numbers to a batt
Page 35: The program here has a temporary su
Page 38 and 39: 1 Create a QuizOne of the most fasc
Page 40 and 41: line 10 for a.word. It is looking f
Page 42 and 43: program if you. don't get it right
Page 44 and 45: 90 PRINT100 PRINT "ADDRESS";TAB lO;
Page 46 and 47: 160 LET D$(7)=•sEE YOUR ANALYST"1
Page 48 and 49: 32 Sentence WriterPractice your Eng
Page 50 and 51: 160 IF GH THEN LET H=G180 GOTO 2020
Page 52 and 53: 30 PRINT A$;40 GOTO 1036 Question &
Page 55: 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 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=$0.08KELL
Page 93 and 94: ending in 95 cents. For instance, a
Page 95 and 96: 100 LET D=l-0.0l*P110 LET R=W/D120
Page 97 and 98: 100 IF H>40 THEN GOTO 140110 LET W=
Page 99 and 100: Unit price is total price divided b
Page 101: The computer generates a table of r
Page 105 and 106: 80 Screen FullFill your video scree
Page 107 and 108: gram lines to draw and seem to move
Page 109 and 110: Program Listing10 CLS100 FOR L=g TO
Page 111 and 112: There are a number of ways to get t
Page 113 and 114: 140 NEXT X200 LET X=INT(63*RND}210
Page 115 and 116: Program Listing10 LET A$=• 1120 F
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100 FOR Y=l5 TO 25 STEP 10110 FOR X
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101 Random Bar GraphIf you don't ha
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Appendix A:Sinclair BASIC WordsHere
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StatementsCLEARCLSCONTCOPYDIMDIM $F
Page 129 and 130:
ooks from ARCsoft PublishersFor the
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101 TIMEX 1000/Sinclair ZX-81Progra
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