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

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line 10 for a.word. It is looking for YES or NO. If it gets aYES, then line 20 sees that it got what it wanted andmoves operations along to line 100.If it gets a NO, then line 20 hasn't received what itwants so program execution moves on to line 30. Here, atline 30, the program finds something useful and shootsoperations down to line 200.If, however, neither YES nor NO were entered at line10, then neither lines 20 nor 30 would be satisfied so actionwould drop to line 40. Here, the error is trapped bycommanding the operator to give one of the two correctanswers. Then, at line 50, the operation is returned to line10 for a new try at the correct input.Program listing5 PRINT wWANT TO PLAY AGAIN ?~10 INPUT A$20 IF A$="'YES'" THEN GOTO 10030 IF A$=~No~ THEN GOTO 20040 PRINT ~PLEASE ANSWER ONLY YES OR NOw50 GOTO 10l 0 0 PRH\lT A$110 STOP200 PRINT A$210 STOPCharacter NumbersThis brief program displays the value for eachkeyboard character, side-by-side with the character itstands for. You will be able quickly to tell what eachnumber prints.Une 40 is a timing loop to slow down the presentationso you c•m digest the information. To make it evenslower, increase the number in line 40. To make itfaster, decrease the number in line 40.38
Program Listing10 FOR L=f.J TO 255 STEP 2120 FOR N=L TO L+2130 PRINT N,CHR$ N40 PAUSE 6050 NEXT N60 CLS70 NEXT L23 One-Time PasswordIf you don't want unauthorized use of your programs,insert a requirement that a user know a password. Thisparticular routine allows only one try at entering a correctpassword.For our password, we have selected "elephant" andstored it in line 30. You can change the password towhatever you like.If a correct attempt at entering the password ismade, program action will progress to line 100. Otherwise,action drops to line 40 and action ends.Program Listing10 PRINT "WHAT IS THE PASSWORD ?"20 INPUT A$30 IF A$="ELEPHANT" THEN GOTO 10040 STOP100 PRINT "YOU GOT IT RIGHT"110 PRINT "A PROGRAM WOULD RUN"24 Three-Tries PasswordHere the software lets you try three times to enter thecorrect password. You don't get to go forward with the39
Page 3: 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$=•• THEN GOTO 200220 I
Page 33 and 34: convert those raw numbers to a batt
Page 35: The program here has a temporary su
Page 38 and 39: 1 Create a QuizOne of the most fasc
Page 42 and 43: program if you. don't get it right
Page 44 and 45: 90 PRINT100 PRINT "ADDRESS";TAB lO;
Page 46 and 47: 160 LET D$(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 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=$0.08KELL
Page 93 and 94:
ending in 95 cents. For instance, a
Page 95 and 96:
100 LET D=l-0.0l*P110 LET R=W/D120
Page 97 and 98:
100 IF H>40 THEN GOTO 140110 LET W=
Page 99 and 100:
Unit price is total price divided b
Page 101:
The computer generates a table of r
Page 105 and 106:
80 Screen FullFill your video scree
Page 107 and 108:
gram lines to draw and seem to move
Page 109 and 110:
Program Listing10 CLS100 FOR L=g TO
Page 111 and 112:
There are a number of ways to get t
Page 113 and 114:
140 NEXT X200 LET X=INT(63*RND}210
Page 115 and 116:
Program Listing10 LET A$=• 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 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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