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THE STEP COMMANDThe computer was counting by one's in the above programs. To make it count by two's,change line 30 to this:30 FOR 1=10 TO 30 STEP 2Assignment 17A:1. Have the computer count by five's from zero to 100.COUNT DOWN LOOPSYou can make the computer count down by using a negative STEP.Try this: 10 REM ** APOLLO 11 **15 POKE 53281,1520 PRINT'clr"30PRINT" T MINUS 12 SECONDS AND COUNTING"35 FOR 1=1 TO 750:NEXT I40 FOR T=11 TO 0 STEP -150 PRINT "clrdn";T60 FOR 1=1 TO 750:NEXT I:REM TIMING LOOP70 NEXTT80 PRINT "clr dn red ALL ENGINES RUNNING, LIFT OFF."81 FOR 1=1 TO750:NEXTI82 PRINT "clr dn grn WE HAVE A LIFT OFF."83 FOR 1=1 TO 750:NEXT I84 PRINT "clr dn blu 32 MINUTES PAST THE HOUR."85 FOR 1-1 TO 750:NEXT I86 PRINT "clr dn cyn LIFT OFF ON APOLLO 11."90 POKE 53281,0Line 60 is the timing loop for counting seconds. Lines 35,81, 83 and 85 slow down theprinting to "speaking speed."NESTED LOOPSIn this program, we have one loop inside another.The outside loop starts in line 40 and ends in line 70.The inside loop is in line 60.These are "nested loops." It is like the baby's set of toy boxes which fit inside each other.100
LOOP VARIABLESTo make sure that each FOR command knows which NEXT command belongs to it, theNEXT command ends in the "loop variable" name. Look at line 60:60 FOR 1=1 TO 2000:NEXT II is the loop variable. And for the loop starting in line 40:T is the loop variable.40 FOR T=12 TO 0 STEP -170 NEXTj"BADLY NESTED LOOPSThe inside loop must be all the way inside:Right:25 FOR X=3 TO 7y-30 FOR Y=3 TO 7( 40 PRINT X*Y\50NEXTY■60 NEXT XWrong:25 FOR X=3 TO 730 FOR Y=3 TO 740 PRINT X*Y50 NEXTX30 NEXT Y101
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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
Page 51 and 52: LESSON 8THE GOTO COMMAND AND THE ST
Page 53 and 54: A CAN OF SPAGHETTILook at this: 10
Page 55 and 56: Assignment 8:1. Just for practice i
Page 57 and 58: LESSON 9 THE IF COMMANDClear the me
Page 59 and 60: JtTHE "NOT EQUAL" SIGNTwo signs:= m
Page 61 and 62: INSTRUCTOR NOTES 10 INTRODUCING NUM
Page 63 and 64: The thing which is put into the box
Page 65 and 66: MIXTURES IN PRINTYou can print numb
Page 67 and 68: INSTRUCTOR NOTES 11TAB AND DELAY LO
Page 69 and 70: HOW BIG A SPACE CAN TAB( ) MAKE?The
Page 71 and 72: INSTRUCTOR NOTES 12 THE IF COMMAND
Page 73 and 74: AN IF INSIDE AN IFThe "teenager" pr
Page 75 and 76: 2. Here is another program. What wi
Page 77 and 78: LESSON 13RANDOM NUMBERS AND THE INT
Page 79 and 80: ROUNDING OFF NUMBERSPerhaps you kno
Page 81 and 82: INSTRUCTOR NOTES 14SAVING TO TAPEWe
Page 83 and 84: The computer automatically turned o
Page 85 and 86: nnr^nnnnnr^nnLOADING A PROGRAM FROM
Page 87 and 88: 5. We are ready to put in the next
Page 89 and 90: n INSTRUCTOR NOTES 15 SOME SHORTCUT
Page 91 and 92: AN INPUT SHORTCUTInstead of10 PRINT
Page 93 and 94: WHEN TO USE THE COLON SHORTCUTUse t
Page 95 and 96: But if we write this line in a prog
Page 97 and 98: LESSON 16 MOVING PICTURESMOVING THE
Page 99 and 100: Line 40 waits for you to see this b
Page 101: LESSON 17FOR-NEXT LOOPSRemember the
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 and 152: nnO INSTRUCTOR NOTES 27 SWITCHING N
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MAKING NUMBERS INTO STRINGSRun10 RE
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Assignment 27:1. Write a program wh
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LESSON 28ACTION GAMES AND THE FUNCT
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LOOKING IN THE KEYBOARD'S BOXHere i
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Run it. It puts a white diamond on
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cTHETARGETS ARE HEARTSAdd these lin
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LESSON 29MUSICGo back and review th
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REGISTER ADDRESSES Base address is
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D^ INSTRUCTOR NOTES 30 ARRAYS AND T
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The DIM... command tells the comput
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1 REM *** EIGHT QUEENS ***2 GOTO 10
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Assignment 30:1. Write a program wh
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LESSON 31SPRITES FOR ACTION GRAPHIC
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Then use the CRSR keys to move the
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MANY SPRITES AT ONCEHere are the bo
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WATCH OUT, TWO SPRITES ARE GOING TO
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LESSON 32USER FRIENDLY PROGRAMSTher
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TIE A STRING AROUND THE USER'S FING
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SET TRAPS FOR ERRORSExample: Add th
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LESSON 33DEBUGGING, STOP, CONTTHE S
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Use the PRINT command to look at va
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RESERVED WORDSABSAND ASC ATNCHR$CLR
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ells and whistlesA phrase going bac
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error trapPart of a program which c
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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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nnnnnnonnnOnooonnnnnnnnonnnHnonnOn
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