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LESSON 15SOME SHORTCUTSA PRINT SHORTCUTInstead of typing PRINT, just type a question mark.Enter10? "HI"LISTThe computer substitutes the word PRINT for the question mark.A LET SHORTCUTThese two lines do the same thing:10LETA=41and10A=41also these two: 20 LET B$="HI" and 20 B$="HI"You can leave out the word LET from the LET statement! The computer knows that youmean LET whenever the line starts with a variable name followed by an "=" sign.88
AN INPUT SHORTCUTInstead of10 PRINT "ENTER YOUR NAME"20 INPUT N$You can do 10 INPUT "ENTER YOUR NAME"; N$Put a semicolon between the message "ENTER YOUR NAME" and the variables.ANOTHER INPUT SHORTCUTYou can INPUT several things in one command. Put commas between the variables.Run20 INPUT "LOCATION"; X,YYou see LOCATION? on the screen.You enter two numbers with a comma between them.LOCATION? 5,6Another example30 INPUT "MONTH, DAY, YEAR";M$,D,YAfter the "?" typeAPRIL.29,1983ERROR MESSAGE ININPUTIf you do not enter enough answers, the computer asks "It". Then you should enter therest.Example:30 INPUT "MONTH, DAY, YEAR";M$,D,Y? MAY, 1?? 1984If you enter too many answers, the computer replies?EXTRA IGNOREDand goes on with the program.Example:55 INPUT'SLEEPY? ";A$? NO.FINE?EXTRA IGNORED89
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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
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
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: n INSTRUCTOR NOTES 15 SOME SHORTCUT
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 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
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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
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nnnnnnonnnOnooonnnnnnnnonnnHnonnOn
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