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DON'T GIVE THE USER A HEADACHESCROLLING gives headaches!BASIC usually scrolls. It writes new lines at the bottom of the screen and pushes oldlines up.It is like the scrolls the Romans used for writing. They unwound from the bottom andwound up at the top.Avoid scrolling. Use CRSR key strings to print just where you want. Erase by printing astring of blanks to the same spot.Use delay loops so the writing stays on the screen while the user reads it.188
SET TRAPS FOR ERRORSExample: Add this line to the above lines:386 IF R$O"N" THEN GOTO 380Line 380 asked for only two choices, Y or N. If the user presses some other key, line 386sends him back to line 380.Traps make your program "bomb proof " so that users will be unable to goof it up!Assignment 32:1. Make a program to write a very large number, 50 digits. Pick the digits at random. Puta comma between each set of three digits. Hint: Make the digits one at a time fromRND(O) and glue them on the end of the number.2. Write a secret cipher program. The user chooses a password and it is used to make acipher alphabet like this:If the password is DRAGONETTEremove the repeated letters, get DRAGONETput it at the front of the alphabet and the rest ofthe letters after it in normal orderDRAGONETBCFHIJKLMPQSUVWXYZcipher alphabetABCDEFGHIJKLMNOPQRSTUVWXYZnormal alphabetThe user chooses to code or decode from a menu.189
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KIDSAND THECOMMODORE 64
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KIDSAND THECOMMODORE 64neoartment o
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nTABLE OF CONTENTSAcknowledgements
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nACKNOWLEDGEMENTS^My sincere thanks
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nTO THE PARENTSThis book is designe
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n~ ABOUT PROGRAMMINGThere is a comm
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nn INSTRUCTOR NOTES 1 NEW, PRINT, R
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COMMAND THE COMPUTERTry this. Type
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THE NUMBER ZERO AND THE LETTER "O"T
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nINSTRUCTOR NOTES 2COLOR AND THE KE
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There are eight colors on the numbe
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OTHER COMMANDS IN PRINT STATEMENTSJ
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LESSON 3 LIST, BOXES IN MEMORYClear
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ADDING A LINEYou can add a new line
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THE DELETE KEYThe DEL key is your "
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INSTRUCTOR NOTES 5 TRICKS WITH PRIN
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RULE: The semicolon makes the invis
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Assignment 5:1- Write a program whi
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LESSON 6THE INPUT COMMANDUse INPUT
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YOU WEAR TWO HATS, USER AND PROGRAM
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LESSON 7THE LET COMMAND, GLUING STR
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GLUING THE STRINGSHere is how to st
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LESSON 8THE GOTO COMMAND AND THE ST
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A CAN OF SPAGHETTILook at this: 10
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Assignment 8:1. Just for practice i
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LESSON 9 THE IF COMMANDClear the me
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JtTHE "NOT EQUAL" SIGNTwo signs:= m
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INSTRUCTOR NOTES 10 INTRODUCING NUM
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The thing which is put into the box
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MIXTURES IN PRINTYou can print numb
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INSTRUCTOR NOTES 11TAB AND DELAY LO
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HOW BIG A SPACE CAN TAB( ) MAKE?The
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INSTRUCTOR NOTES 12 THE IF COMMAND
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AN IF INSIDE AN IFThe "teenager" pr
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2. Here is another program. What wi
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LESSON 13RANDOM NUMBERS AND THE INT
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ROUNDING OFF NUMBERSPerhaps you kno
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INSTRUCTOR NOTES 14SAVING TO TAPEWe
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The computer automatically turned o
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nnr^nnnnnr^nnLOADING A PROGRAM FROM
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5. We are ready to put in the next
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n INSTRUCTOR NOTES 15 SOME SHORTCUT
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AN INPUT SHORTCUTInstead of10 PRINT
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WHEN TO USE THE COLON SHORTCUTUse t
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But if we write this line in a prog
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LESSON 16 MOVING PICTURESMOVING THE
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Line 40 waits for you to see this b
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LESSON 17FOR-NEXT LOOPSRemember the
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LOOP VARIABLESTo make sure that eac
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^ INSTRUCTOR NOTES 18 DATA, READ, R
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STRANGE RULES1. It doesn't matter w
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MIXTURES OF DATAThe DATA statement
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LESSON 19SOUND EFFECTSTurn up the s
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TONES BY THE BUSHELEnter: 10 REM **
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"TM" stands for "timbre." Timbre is
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INSTRUCTOR NOTES 20NAMES, CLOCKS AN
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cAnytimeyou type, the characters ar
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LESSON 21COLOR GRAPHICSADJUST YOUR
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Add these lines to the above progra
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INSTRUCTOR NOTES 22POKEing GRAPHICS
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Try this: Change the number 83 to a
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We can number the streets and house
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n INSTRUCTOR NOTES 23 SECRET WRITIN
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THE COMPUTER ISIMPATIENTThe compute
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^ INSTRUCTOR NOTES 24 PRETTY PROGRA
Page 137 and 138: Assignment 24A:1. The delay loop is
Page 139 and 140: Assignment 24B:1. Write a short pro
Page 141 and 142: LESSON 25 LOGIC: AND, OR, NOTANOTHE
Page 143 and 144: THE IF COMMAND TELLS LITTLE WHITE L
Page 145 and 146: THE LOGIC SIGNSYou can use these si
Page 147 and 148: LESSON 26 SNIPPING STRINGS: LEFTS,
Page 149 and 150: CUTTING A PIECE OUT OF THE MIDDLETh
Page 151 and 152: nnO INSTRUCTOR NOTES 27 SWITCHING N
Page 153 and 154: MAKING NUMBERS INTO STRINGSRun10 RE
Page 155 and 156: Assignment 27:1. Write a program wh
Page 157 and 158: LESSON 28ACTION GAMES AND THE FUNCT
Page 159 and 160: LOOKING IN THE KEYBOARD'S BOXHere i
Page 161 and 162: Run it. It puts a white diamond on
Page 163 and 164: cTHETARGETS ARE HEARTSAdd these lin
Page 165 and 166: LESSON 29MUSICGo back and review th
Page 167 and 168: REGISTER ADDRESSES Base address is
Page 169 and 170: D^ INSTRUCTOR NOTES 30 ARRAYS AND T
Page 171 and 172: The DIM... command tells the comput
Page 173 and 174: 1 REM *** EIGHT QUEENS ***2 GOTO 10
Page 175 and 176: Assignment 30:1. Write a program wh
Page 177 and 178: LESSON 31SPRITES FOR ACTION GRAPHIC
Page 179 and 180: Then use the CRSR keys to move the
Page 181 and 182: MANY SPRITES AT ONCEHere are the bo
Page 183 and 184: WATCH OUT, TWO SPRITES ARE GOING TO
Page 185 and 186: LESSON 32USER FRIENDLY PROGRAMSTher
Page 187: TIE A STRING AROUND THE USER'S FING
Page 191 and 192: LESSON 33DEBUGGING, STOP, CONTTHE S
Page 193 and 194: Use the PRINT command to look at va
Page 195 and 196: RESERVED WORDSABSAND ASC ATNCHR$CLR
Page 197 and 198: ells and whistlesA phrase going bac
Page 199 and 200: error trapPart of a program which c
Page 201 and 202: listingA list of all the lines in a
Page 203 and 204: emarkA comment you make in the prog
Page 205 and 206: variableA name given to a box in me
Page 207 and 208: FORMULA TOO COMPLEXYou wrote a stri
Page 209 and 210: SYNTAXYou "spelled" the line wrong.
Page 211 and 212: 1 REM A4-310 REM*** SMILE***13 POKE
Page 213 and 214: 1 REM A6-210 REM*** FAVORITE***15 P
Page 215 and 216: ~ 40 INPUT C$1 REM A9B-210 REM ***
Page 217 and 218: ^ 1 REM A11A-210 REM !"#$% INSULTS
Page 219 and 220: 1 REM A12B-410 REM *** PICK A CARD
Page 221 and 222: ^ 1 REM A15-210 REM!!! VACATION!!!r
Page 223 and 224: ■1 REMA17B-510 REM*** OPERA SOPRA
Page 225 and 226: 1 REM A22-110 REM *** COLORED BOX *
Page 227 and 228: 1 REM A24B-1r> 10 REM*** SUBROUTINE
Page 229 and 230: 1 REM A26-210 REM*** ANSWERER***12
Page 231 and 232: 1 REM A27-110 REM *** BACKWARD ***1
Page 233 and 234: 441 FOR l=2 TO LEN(A$]442L1$=MID$(F
Page 235 and 236: INDEX OF TOPICSaddition 59,74ADSR 1
Page 237 and 238: memory 16, 24-26, 45, 59, 81, 83,11
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