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LESSON 27SWITCHING NUMBERS WITH STRINGSThis lesson explains two functions: VAL( ) and STR$( ).MAKING STRINGS INTO NUMBERSWe have two kinds of variables: strings and numbers. We can change one kind into theother.Run10 REM STRINGS INTO NUMBERS20 PRINT'clr"30L$="123":M$="789"50 L=VAL(L$):M=VAL(M$)70 PRINT L72 PRINT M74 PRINT "76 PRINT L+MVAL stands for value. It changes a string to a number, if it can.152
MAKING NUMBERS INTO STRINGSRun10 REM NUMBERS INTO STRINGS20 PRINT "clr"21 POKE 53281,025 INPUT" GIVE ME A NUMBER ";NB30 N$=STR$[NB)35 L=LEN(N$)40FORI=LTO1 STEP-145B$=B$+MID$(N$,I,1)50 NEXT I60 PRINT "cyn dn HERE IT IS BACKWARDS dn"65 PRINT "dn";B$STR$ stands for string. It changes a number to a string.FUNCTIONS AGAINIn this book we use these functions:RND() INT()LEFT$() RIGHT$() MID$()VAL() STR$()ASC() CHR$() PEEK()LEN()153
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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
Page 101 and 102: LESSON 17FOR-NEXT LOOPSRemember the
Page 103 and 104: LOOP VARIABLESTo make sure that eac
Page 105 and 106: ^ INSTRUCTOR NOTES 18 DATA, READ, R
Page 107 and 108: STRANGE RULES1. It doesn't matter w
Page 109 and 110: MIXTURES OF DATAThe DATA statement
Page 111 and 112: LESSON 19SOUND EFFECTSTurn up the s
Page 113 and 114: TONES BY THE BUSHELEnter: 10 REM **
Page 115 and 116: "TM" stands for "timbre." Timbre is
Page 117 and 118: INSTRUCTOR NOTES 20NAMES, CLOCKS AN
Page 119 and 120: cAnytimeyou type, the characters ar
Page 121 and 122: LESSON 21COLOR GRAPHICSADJUST YOUR
Page 123 and 124: Add these lines to the above progra
Page 125 and 126: INSTRUCTOR NOTES 22POKEing GRAPHICS
Page 127 and 128: Try this: Change the number 83 to a
Page 129 and 130: We can number the streets and house
Page 131 and 132: n INSTRUCTOR NOTES 23 SECRET WRITIN
Page 133 and 134: THE COMPUTER ISIMPATIENTThe compute
Page 135 and 136: ^ 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: nnO INSTRUCTOR NOTES 27 SWITCHING N
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 and 188: TIE A STRING AROUND THE USER'S FING
Page 189 and 190: SET TRAPS FOR ERRORSExample: Add th
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
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emarkA comment you make in the prog
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variableA name given to a box in me
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FORMULA TOO COMPLEXYou wrote a stri
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SYNTAXYou "spelled" the line wrong.
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1 REM A4-310 REM*** SMILE***13 POKE
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1 REM A6-210 REM*** FAVORITE***15 P
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~ 40 INPUT C$1 REM A9B-210 REM ***
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^ 1 REM A11A-210 REM !"#$% INSULTS
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1 REM A12B-410 REM *** PICK A CARD
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^ 1 REM A15-210 REM!!! VACATION!!!r
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■1 REMA17B-510 REM*** OPERA SOPRA
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1 REM A22-110 REM *** COLORED BOX *
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1 REM A24B-1r> 10 REM*** SUBROUTINE
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1 REM A26-210 REM*** ANSWERER***12
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1 REM A27-110 REM *** BACKWARD ***1
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441 FOR l=2 TO LEN(A$]442L1$=MID$(F
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INDEX OF TOPICSaddition 59,74ADSR 1
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memory 16, 24-26, 45, 59, 81, 83,11
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