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THE NEW COMMANDType N EW and press RETURN.NEW empties the computer's memory so you can put your program into it.HOW TO ENTER A LINEWhen we say "enter" we will always mean to do these two things:1) Type a line2) then press the RETURN key.Clear the screen and enter this line:10 PRINT "HI"(The " marks are quotation marks. To make " marks, hold down the SHIFT key andpress the key which has the 2 and the " on it.)(Did you remember to press the RETURN key at the end of the line?)Now line number 10 is in the computer's memory.It will stay in memory:until you enter the NEW commandor until you turn off the computer.Line 10 is a very short program.16
THE NUMBER ZERO AND THE LETTER "O"The computer always writes the zero like this:zero 0and the letter 0 like this:letter 0 0You have to be careful to do the same.right 10 PRINT "HI"wrong 10 PRINT "HI"WHAT IS A PROGRAM?A program is a list of commands for the computer to do. The commands are written inlines. Each line starts with a number. The program you entered above has only one line.HOW TO RUN A PROGRAMA moment ago you put this program into memory:10PRINT"HI"Now enterRUN(Did you remember to press the RETURN key?)The RUN command tells the computer to look into its memory for a program and then toobey the commands it reads in the lines.Did the computer obey the PRINT command? The PRINT command tells the computer toprint whatever is between the quotation marks. The computer printed:HIREADY.17
Page 3 and 4: KIDSAND THECOMMODORE 64
Page 5 and 6: KIDSAND THECOMMODORE 64neoartment o
Page 7 and 8: nTABLE OF CONTENTSAcknowledgements
Page 9 and 10: nACKNOWLEDGEMENTS^My sincere thanks
Page 11 and 12: nTO THE PARENTSThis book is designe
Page 13 and 14: n~ ABOUT PROGRAMMINGThere is a comm
Page 15 and 16: nn INSTRUCTOR NOTES 1 NEW, PRINT, R
Page 17: COMMAND THE COMPUTERTry this. Type
Page 21 and 22: nINSTRUCTOR NOTES 2COLOR AND THE KE
Page 23 and 24: There are eight colors on the numbe
Page 25 and 26: OTHER COMMANDS IN PRINT STATEMENTSJ
Page 27 and 28: LESSON 3 LIST, BOXES IN MEMORYClear
Page 29: ADDING A LINEYou can add a new line
Page 35 and 36: THE DELETE KEYThe DEL key is your "
Page 37 and 38: INSTRUCTOR NOTES 5 TRICKS WITH PRIN
Page 39 and 40: RULE: The semicolon makes the invis
Page 41 and 42: Assignment 5:1- Write a program whi
Page 43 and 44: LESSON 6THE INPUT COMMANDUse INPUT
Page 45 and 46: YOU WEAR TWO HATS, USER AND PROGRAM
Page 47 and 48: LESSON 7THE LET COMMAND, GLUING STR
Page 49 and 50: 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
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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
Page 109 and 110:
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
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Assignment 24A:1. The delay loop is
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Assignment 24B:1. Write a short pro
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LESSON 25 LOGIC: AND, OR, NOTANOTHE
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THE IF COMMAND TELLS LITTLE WHITE L
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THE LOGIC SIGNSYou can use these si
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LESSON 26 SNIPPING STRINGS: LEFTS,
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CUTTING A PIECE OUT OF THE MIDDLETh
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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
Page 239:
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