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V/+BTEAS4
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Greaseweazled » adfs_EUG_55.adf |
| Filename: | V/+BTEAS4 |
| Read OK: | ✔ |
| File size: | 1172 bytes |
| Load address: | 2B204556 |
| Exec address: | 41455442 |
Duplicates
There are 3 duplicate copies of this file in the archive:
- AEW website » eug » eug_3_5_discs_Eug-55_A-EUG55.adf » V/+BTEAS4
- AEW website » eug » eug_5_25_discs_Eug-55_D-EUG55.dsd » V.+BTEAS4
- Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_55.ADF » V/+BTEAS4
- Personal collection » Acorn ADFS disks » Greaseweazled » adfs_EUG_55.adf » V/+BTEAS4
File contents
BRAINTEASERS
By G. Ludinski
WELCOME to the fourth article which supplements two programs on the
'Arts' Menu (followed by "(BT)" in brackets). This issue presents DON'T
PAINT THE CAT and NAME THE GRAPH; fairly advanced playthings from Gene-
vieve Ludinski that are designed for ages 7+ and 11+ respectively. The
input procedures particularly on NAME THE GRAPH are cleverly orchestrat-
ed (Take a look at the code!) Note as usual that brief instructions
appear on screen before each program.
DON'T PAINT THE CAT
SEEMS a strange title for a program. I mean, who would want to emulsion
paint the family mogg anyway?
Well you see, the family have decided that you have to paint the gar-
den fence. You lost the draw - it might have been your sister instead
who had to do it, but never mind, there's always next time. Across the
fence from you and your fantastic paint brush, is your neighbour's
transistor. As a mental challenge you have decided to paint the fence
according to the high/low pitch of your neighbour's music.
Look out for your cat. It's parked at the end of the fence!
How to play
AS the game begins you will hear just two notes to compare but, every
time you get the answer correct, the next tune will have an extra note.
You will be told which two notes to compare, and you must input H or
L for High or Low.
If you get it wrong, you must wait for the fence and the poor old
pussy, to be painted. If you take too long to answer, the cat will wind
up getting covered in paint anyway.
Press <RETURN> when you want a new tune.
Programming hints
IF you can work out the answer long before the cat is painted, then re-
duce the 50 of INKEY$(50) in line 350.
If you find that it is too difficult to tell the difference between
the notes, then increase the 5 after the '*' sign in line 280.
Alternatively you can increase the time allowed to answer, or reduce
the difference between the notes, by doing the opposite of what is des-
cribed above.
NAME THE GRAPH
THIS is a game of logic. You have an aim, to find the equation of the
graph that is drawn on the screen. You key in numbers to represent an
equation. You can see straight away whether you are getting closer to
your goal as the graph of the equation you keyed in is drawn on the
screen.
By making the three numbers required larger and smaller, postive and
negative, you can see how it effects the graph and hopefully, you can
watch your graph getting closer and closer to the target graph until you
hit it.
If you give up you will be told the answer, but don't cheat!
How to play
ALL graphs drawn are of the type:
Y=Ax^2+Bx+C
where A, B and C are constants (that is, numbers that can be positive or
negative). For example, the equation might be:
Y=-2x^2+3x-5
and in this case A would be equal to -2, B equal to 3 and C to -5.
You must key in three numbers all at once on the same line and sepa-
rated by commas. Press <RETURN> only after you have keyed in all three
numbers. In the example above, you would key in:
-2,3,-5 then <RETURN>
Then the graph of this expression is drawn and you must make another
guess. If you cannot guess the answer, key in:
WHAT,IS,IT then <RETURN>
(remember to put in the commas) and you will be given the answer and the
program ends.
If you guess the answer correctly then press <ESCAPE> and a new graph
will be drawn.
It is more fun to find out how to do it by trial and error, but if
you want a hint then this is it. (Skip the next paragraph if you do not
want to know.)
If the first number (A) is positive, then the graph will point up-
wards (u shape), and if it is negative, the graph will point downwards
(n shape).
Programming hints
THE graphs are plotted with the origin (zero, zero point) at the middle
of the screen by using the VDU statement in line 50. This saves a lot of
unnecessary maths.
You could make the programs easier by reducing the range of the num-
bers allowed. Do this by reducing the 5 in line 280 or the 9 in line 290
or both. If you want to make it very easy you can allow only positive
numbers by deleting line 300.
The program uses Mode 1 to enable guessed graphs to be displayed in
red, and the target graph in white. On a BBC Model A, you will need to
change line 40 to Mode 1. The program then runs without colour.
Genevieve Ludinski, EUG #55
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000010 20 20 20 20 20 20 20 20 20 20 20 20 20 42 52 41 | BRA| 00000020 49 4e 54 45 41 53 45 52 53 0d 20 20 20 20 20 20 |INTEASERS. | 00000030 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000040 20 20 20 20 20 20 42 79 20 47 2e 20 4c 75 64 69 | By G. Ludi| 00000050 6e 73 6b 69 0d 0d 57 45 4c 43 4f 4d 45 20 74 6f |nski..WELCOME to| 00000060 20 74 68 65 20 66 6f 75 72 74 68 20 61 72 74 69 | the fourth arti| 00000070 63 6c 65 20 77 68 69 63 68 20 73 75 70 70 6c 65 |cle which supple| 00000080 6d 65 6e 74 73 20 74 77 6f 20 70 72 6f 67 72 61 |ments two progra| 00000090 6d 73 20 6f 6e 20 74 68 65 20 0d 27 41 72 74 73 |ms on the .'Arts| 000000a0 27 20 4d 65 6e 75 20 28 66 6f 6c 6c 6f 77 65 64 |' Menu (followed| 000000b0 20 62 79 20 22 28 42 54 29 22 20 69 6e 20 62 72 | by "(BT)" in br| 000000c0 61 63 6b 65 74 73 29 2e 20 54 68 69 73 20 69 73 |ackets). This is| 000000d0 73 75 65 20 70 72 65 73 65 6e 74 73 20 44 4f 4e |sue presents DON| 000000e0 27 54 0d 50 41 49 4e 54 20 54 48 45 20 43 41 54 |'T.PAINT THE CAT| 000000f0 20 61 6e 64 20 4e 41 4d 45 20 54 48 45 20 47 52 | and NAME THE GR| 00000100 41 50 48 3b 20 66 61 69 72 6c 79 20 61 64 76 61 |APH; fairly adva| 00000110 6e 63 65 64 20 70 6c 61 79 74 68 69 6e 67 73 20 |nced playthings | 00000120 66 72 6f 6d 20 47 65 6e 65 2d 0d 76 69 65 76 65 |from Gene-.vieve| 00000130 20 4c 75 64 69 6e 73 6b 69 20 74 68 61 74 20 61 | Ludinski that a| 00000140 72 65 20 64 65 73 69 67 6e 65 64 20 66 6f 72 20 |re designed for | 00000150 61 67 65 73 20 37 2b 20 61 6e 64 20 31 31 2b 20 |ages 7+ and 11+ | 00000160 72 65 73 70 65 63 74 69 76 65 6c 79 2e 20 54 68 |respectively. Th| 00000170 65 0d 69 6e 70 75 74 20 70 72 6f 63 65 64 75 72 |e.input procedur| 00000180 65 73 20 70 61 72 74 69 63 75 6c 61 72 6c 79 20 |es particularly | 00000190 6f 6e 20 4e 41 4d 45 20 54 48 45 20 47 52 41 50 |on NAME THE GRAP| 000001a0 48 20 61 72 65 20 63 6c 65 76 65 72 6c 79 20 6f |H are cleverly o| 000001b0 72 63 68 65 73 74 72 61 74 2d 0d 65 64 20 28 54 |rchestrat-.ed (T| 000001c0 61 6b 65 20 61 20 6c 6f 6f 6b 20 61 74 20 74 68 |ake a look at th| 000001d0 65 20 63 6f 64 65 21 29 20 4e 6f 74 65 20 61 73 |e code!) Note as| 000001e0 20 75 73 75 61 6c 20 74 68 61 74 20 62 72 69 65 | usual that brie| 000001f0 66 20 69 6e 73 74 72 75 63 74 69 6f 6e 73 20 0d |f instructions .| 00000200 61 70 70 65 61 72 20 6f 6e 20 73 63 72 65 65 6e |appear on screen| 00000210 20 62 65 66 6f 72 65 20 65 61 63 68 20 70 72 6f | before each pro| 00000220 67 72 61 6d 2e 0d 0d 44 4f 4e 27 54 20 50 41 49 |gram...DON'T PAI| 00000230 4e 54 20 54 48 45 20 43 41 54 0d 53 45 45 4d 53 |NT THE CAT.SEEMS| 00000240 20 61 20 73 74 72 61 6e 67 65 20 74 69 74 6c 65 | a strange title| 00000250 20 66 6f 72 20 61 20 70 72 6f 67 72 61 6d 2e 20 | for a program. | 00000260 49 20 6d 65 61 6e 2c 20 77 68 6f 20 77 6f 75 6c |I mean, who woul| 00000270 64 20 77 61 6e 74 20 74 6f 20 65 6d 75 6c 73 69 |d want to emulsi| 00000280 6f 6e 0d 70 61 69 6e 74 20 74 68 65 20 66 61 6d |on.paint the fam| 00000290 69 6c 79 20 6d 6f 67 67 20 61 6e 79 77 61 79 3f |ily mogg anyway?| 000002a0 0d 20 20 20 57 65 6c 6c 20 79 6f 75 20 73 65 65 |. Well you see| 000002b0 2c 20 74 68 65 20 66 61 6d 69 6c 79 20 68 61 76 |, the family hav| 000002c0 65 20 64 65 63 69 64 65 64 20 74 68 61 74 20 79 |e decided that y| 000002d0 6f 75 20 68 61 76 65 20 74 6f 20 70 61 69 6e 74 |ou have to paint| 000002e0 20 74 68 65 20 67 61 72 2d 0d 64 65 6e 20 66 65 | the gar-.den fe| 000002f0 6e 63 65 2e 20 59 6f 75 20 6c 6f 73 74 20 74 68 |nce. You lost th| 00000300 65 20 64 72 61 77 20 2d 20 69 74 20 6d 69 67 68 |e draw - it migh| 00000310 74 20 68 61 76 65 20 62 65 65 6e 20 79 6f 75 72 |t have been your| 00000320 20 73 69 73 74 65 72 20 69 6e 73 74 65 61 64 20 | sister instead | 00000330 0d 77 68 6f 20 68 61 64 20 74 6f 20 64 6f 20 69 |.who had to do i| 00000340 74 2c 20 62 75 74 20 6e 65 76 65 72 20 6d 69 6e |t, but never min| 00000350 64 2c 20 74 68 65 72 65 27 73 20 61 6c 77 61 79 |d, there's alway| 00000360 73 20 6e 65 78 74 20 74 69 6d 65 2e 20 41 63 72 |s next time. Acr| 00000370 6f 73 73 20 74 68 65 0d 66 65 6e 63 65 20 66 72 |oss the.fence fr| 00000380 6f 6d 20 79 6f 75 20 61 6e 64 20 79 6f 75 72 20 |om you and your | 00000390 66 61 6e 74 61 73 74 69 63 20 70 61 69 6e 74 20 |fantastic paint | 000003a0 62 72 75 73 68 2c 20 69 73 20 79 6f 75 72 20 6e |brush, is your n| 000003b0 65 69 67 68 62 6f 75 72 27 73 0d 74 72 61 6e 73 |eighbour's.trans| 000003c0 69 73 74 6f 72 2e 20 41 73 20 61 20 6d 65 6e 74 |istor. As a ment| 000003d0 61 6c 20 63 68 61 6c 6c 65 6e 67 65 20 79 6f 75 |al challenge you| 000003e0 20 68 61 76 65 20 64 65 63 69 64 65 64 20 74 6f | have decided to| 000003f0 20 70 61 69 6e 74 20 74 68 65 20 66 65 6e 63 65 | paint the fence| 00000400 0d 61 63 63 6f 72 64 69 6e 67 20 74 6f 20 74 68 |.according to th| 00000410 65 20 68 69 67 68 2f 6c 6f 77 20 70 69 74 63 68 |e high/low pitch| 00000420 20 6f 66 20 79 6f 75 72 20 6e 65 69 67 68 62 6f | of your neighbo| 00000430 75 72 27 73 20 6d 75 73 69 63 2e 0d 20 20 20 4c |ur's music.. L| 00000440 6f 6f 6b 20 6f 75 74 20 66 6f 72 20 79 6f 75 72 |ook out for your| 00000450 20 63 61 74 2e 20 49 74 27 73 20 70 61 72 6b 65 | cat. It's parke| 00000460 64 20 61 74 20 74 68 65 20 65 6e 64 20 6f 66 20 |d at the end of | 00000470 74 68 65 20 66 65 6e 63 65 21 0d 0d 48 6f 77 20 |the fence!..How | 00000480 74 6f 20 70 6c 61 79 0d 41 53 20 74 68 65 20 67 |to play.AS the g| 00000490 61 6d 65 20 62 65 67 69 6e 73 20 79 6f 75 20 77 |ame begins you w| 000004a0 69 6c 6c 20 68 65 61 72 20 6a 75 73 74 20 74 77 |ill hear just tw| 000004b0 6f 20 6e 6f 74 65 73 20 74 6f 20 63 6f 6d 70 61 |o notes to compa| 000004c0 72 65 20 62 75 74 2c 20 65 76 65 72 79 20 0d 74 |re but, every .t| 000004d0 69 6d 65 20 79 6f 75 20 67 65 74 20 74 68 65 20 |ime you get the | 000004e0 61 6e 73 77 65 72 20 63 6f 72 72 65 63 74 2c 20 |answer correct, | 000004f0 74 68 65 20 6e 65 78 74 20 74 75 6e 65 20 77 69 |the next tune wi| 00000500 6c 6c 20 68 61 76 65 20 61 6e 20 65 78 74 72 61 |ll have an extra| 00000510 20 6e 6f 74 65 2e 0d 20 20 20 59 6f 75 20 77 69 | note.. You wi| 00000520 6c 6c 20 62 65 20 74 6f 6c 64 20 77 68 69 63 68 |ll be told which| 00000530 20 74 77 6f 20 6e 6f 74 65 73 20 74 6f 20 63 6f | two notes to co| 00000540 6d 70 61 72 65 2c 20 61 6e 64 20 79 6f 75 20 6d |mpare, and you m| 00000550 75 73 74 20 69 6e 70 75 74 20 48 20 6f 72 0d 4c |ust input H or.L| 00000560 20 66 6f 72 20 48 69 67 68 20 6f 72 20 4c 6f 77 | for High or Low| 00000570 2e 0d 20 20 20 49 66 20 79 6f 75 20 67 65 74 20 |.. If you get | 00000580 69 74 20 77 72 6f 6e 67 2c 20 79 6f 75 20 6d 75 |it wrong, you mu| 00000590 73 74 20 77 61 69 74 20 66 6f 72 20 74 68 65 20 |st wait for the | 000005a0 66 65 6e 63 65 20 61 6e 64 20 74 68 65 20 70 6f |fence and the po| 000005b0 6f 72 20 6f 6c 64 20 0d 70 75 73 73 79 2c 20 74 |or old .pussy, t| 000005c0 6f 20 62 65 20 70 61 69 6e 74 65 64 2e 20 49 66 |o be painted. If| 000005d0 20 79 6f 75 20 74 61 6b 65 20 74 6f 6f 20 6c 6f | you take too lo| 000005e0 6e 67 20 74 6f 20 61 6e 73 77 65 72 2c 20 74 68 |ng to answer, th| 000005f0 65 20 63 61 74 20 77 69 6c 6c 20 77 69 6e 64 0d |e cat will wind.| 00000600 75 70 20 67 65 74 74 69 6e 67 20 63 6f 76 65 72 |up getting cover| 00000610 65 64 20 69 6e 20 70 61 69 6e 74 20 61 6e 79 77 |ed in paint anyw| 00000620 61 79 2e 0d 20 20 20 50 72 65 73 73 20 3c 52 45 |ay.. Press <RE| 00000630 54 55 52 4e 3e 20 77 68 65 6e 20 79 6f 75 20 77 |TURN> when you w| 00000640 61 6e 74 20 61 20 6e 65 77 20 74 75 6e 65 2e 0d |ant a new tune..| 00000650 0d 50 72 6f 67 72 61 6d 6d 69 6e 67 20 68 69 6e |.Programming hin| 00000660 74 73 0d 49 46 20 79 6f 75 20 63 61 6e 20 77 6f |ts.IF you can wo| 00000670 72 6b 20 6f 75 74 20 74 68 65 20 61 6e 73 77 65 |rk out the answe| 00000680 72 20 6c 6f 6e 67 20 62 65 66 6f 72 65 20 74 68 |r long before th| 00000690 65 20 63 61 74 20 69 73 20 70 61 69 6e 74 65 64 |e cat is painted| 000006a0 2c 20 74 68 65 6e 20 72 65 2d 0d 64 75 63 65 20 |, then re-.duce | 000006b0 74 68 65 20 35 30 20 6f 66 20 49 4e 4b 45 59 24 |the 50 of INKEY$| 000006c0 28 35 30 29 20 69 6e 20 6c 69 6e 65 20 33 35 30 |(50) in line 350| 000006d0 2e 0d 20 20 20 49 66 20 79 6f 75 20 66 69 6e 64 |.. If you find| 000006e0 20 74 68 61 74 20 69 74 20 69 73 20 74 6f 6f 20 | that it is too | 000006f0 64 69 66 66 69 63 75 6c 74 20 74 6f 20 74 65 6c |difficult to tel| 00000700 6c 20 74 68 65 20 64 69 66 66 65 72 65 6e 63 65 |l the difference| 00000710 20 62 65 74 77 65 65 6e 0d 74 68 65 20 6e 6f 74 | between.the not| 00000720 65 73 2c 20 74 68 65 6e 20 69 6e 63 72 65 61 73 |es, then increas| 00000730 65 20 74 68 65 20 35 20 61 66 74 65 72 20 74 68 |e the 5 after th| 00000740 65 20 27 2a 27 20 73 69 67 6e 20 69 6e 20 6c 69 |e '*' sign in li| 00000750 6e 65 20 32 38 30 2e 0d 20 20 20 41 6c 74 65 72 |ne 280.. Alter| 00000760 6e 61 74 69 76 65 6c 79 20 79 6f 75 20 63 61 6e |natively you can| 00000770 20 69 6e 63 72 65 61 73 65 20 74 68 65 20 74 69 | increase the ti| 00000780 6d 65 20 61 6c 6c 6f 77 65 64 20 74 6f 20 61 6e |me allowed to an| 00000790 73 77 65 72 2c 20 6f 72 20 72 65 64 75 63 65 0d |swer, or reduce.| 000007a0 74 68 65 20 64 69 66 66 65 72 65 6e 63 65 20 62 |the difference b| 000007b0 65 74 77 65 65 6e 20 74 68 65 20 6e 6f 74 65 73 |etween the notes| 000007c0 2c 20 62 79 20 64 6f 69 6e 67 20 74 68 65 20 6f |, by doing the o| 000007d0 70 70 6f 73 69 74 65 20 6f 66 20 77 68 61 74 20 |pposite of what | 000007e0 69 73 20 64 65 73 2d 0d 63 72 69 62 65 64 20 61 |is des-.cribed a| 000007f0 62 6f 76 65 2e 0d 0d 4e 41 4d 45 20 54 48 45 20 |bove...NAME THE | 00000800 47 52 41 50 48 0d 54 48 49 53 20 69 73 20 61 20 |GRAPH.THIS is a | 00000810 67 61 6d 65 20 6f 66 20 6c 6f 67 69 63 2e 20 59 |game of logic. Y| 00000820 6f 75 20 68 61 76 65 20 61 6e 20 61 69 6d 2c 20 |ou have an aim, | 00000830 74 6f 20 66 69 6e 64 20 74 68 65 20 65 71 75 61 |to find the equa| 00000840 74 69 6f 6e 20 6f 66 20 74 68 65 0d 67 72 61 70 |tion of the.grap| 00000850 68 20 74 68 61 74 20 69 73 20 64 72 61 77 6e 20 |h that is drawn | 00000860 6f 6e 20 74 68 65 20 73 63 72 65 65 6e 2e 20 59 |on the screen. Y| 00000870 6f 75 20 6b 65 79 20 69 6e 20 6e 75 6d 62 65 72 |ou key in number| 00000880 73 20 74 6f 20 72 65 70 72 65 73 65 6e 74 20 61 |s to represent a| 00000890 6e 0d 65 71 75 61 74 69 6f 6e 2e 20 59 6f 75 20 |n.equation. You | 000008a0 63 61 6e 20 73 65 65 20 73 74 72 61 69 67 68 74 |can see straight| 000008b0 20 61 77 61 79 20 77 68 65 74 68 65 72 20 79 6f | away whether yo| 000008c0 75 20 61 72 65 20 67 65 74 74 69 6e 67 20 63 6c |u are getting cl| 000008d0 6f 73 65 72 20 74 6f 20 0d 79 6f 75 72 20 67 6f |oser to .your go| 000008e0 61 6c 20 61 73 20 74 68 65 20 67 72 61 70 68 20 |al as the graph | 000008f0 6f 66 20 74 68 65 20 65 71 75 61 74 69 6f 6e 20 |of the equation | 00000900 79 6f 75 20 6b 65 79 65 64 20 69 6e 20 69 73 20 |you keyed in is | 00000910 64 72 61 77 6e 20 6f 6e 20 74 68 65 0d 73 63 72 |drawn on the.scr| 00000920 65 65 6e 2e 0d 20 20 20 42 79 20 6d 61 6b 69 6e |een.. By makin| 00000930 67 20 74 68 65 20 74 68 72 65 65 20 6e 75 6d 62 |g the three numb| 00000940 65 72 73 20 72 65 71 75 69 72 65 64 20 6c 61 72 |ers required lar| 00000950 67 65 72 20 61 6e 64 20 73 6d 61 6c 6c 65 72 2c |ger and smaller,| 00000960 20 70 6f 73 74 69 76 65 20 61 6e 64 0d 6e 65 67 | postive and.neg| 00000970 61 74 69 76 65 2c 20 79 6f 75 20 63 61 6e 20 73 |ative, you can s| 00000980 65 65 20 68 6f 77 20 69 74 20 65 66 66 65 63 74 |ee how it effect| 00000990 73 20 74 68 65 20 67 72 61 70 68 20 61 6e 64 20 |s the graph and | 000009a0 68 6f 70 65 66 75 6c 6c 79 2c 20 79 6f 75 20 63 |hopefully, you c| 000009b0 61 6e 20 0d 77 61 74 63 68 20 79 6f 75 72 20 67 |an .watch your g| 000009c0 72 61 70 68 20 67 65 74 74 69 6e 67 20 63 6c 6f |raph getting clo| 000009d0 73 65 72 20 61 6e 64 20 63 6c 6f 73 65 72 20 74 |ser and closer t| 000009e0 6f 20 74 68 65 20 74 61 72 67 65 74 20 67 72 61 |o the target gra| 000009f0 70 68 20 75 6e 74 69 6c 20 79 6f 75 0d 68 69 74 |ph until you.hit| 00000a00 20 69 74 2e 0d 20 20 20 49 66 20 79 6f 75 20 67 | it.. If you g| 00000a10 69 76 65 20 75 70 20 79 6f 75 20 77 69 6c 6c 20 |ive up you will | 00000a20 62 65 20 74 6f 6c 64 20 74 68 65 20 61 6e 73 77 |be told the answ| 00000a30 65 72 2c 20 62 75 74 20 64 6f 6e 27 74 20 63 68 |er, but don't ch| 00000a40 65 61 74 21 0d 0d 48 6f 77 20 74 6f 20 70 6c 61 |eat!..How to pla| 00000a50 79 0d 41 4c 4c 20 67 72 61 70 68 73 20 64 72 61 |y.ALL graphs dra| 00000a60 77 6e 20 61 72 65 20 6f 66 20 74 68 65 20 74 79 |wn are of the ty| 00000a70 70 65 3a 0d 20 20 20 20 20 20 59 3d 41 78 5e 32 |pe:. Y=Ax^2| 00000a80 2b 42 78 2b 43 0d 0d 77 68 65 72 65 20 41 2c 20 |+Bx+C..where A, | 00000a90 42 20 61 6e 64 20 43 20 61 72 65 20 63 6f 6e 73 |B and C are cons| 00000aa0 74 61 6e 74 73 20 28 74 68 61 74 20 69 73 2c 20 |tants (that is, | 00000ab0 6e 75 6d 62 65 72 73 20 74 68 61 74 20 63 61 6e |numbers that can| 00000ac0 20 62 65 20 70 6f 73 69 74 69 76 65 20 6f 72 0d | be positive or.| 00000ad0 6e 65 67 61 74 69 76 65 29 2e 20 46 6f 72 20 65 |negative). For e| 00000ae0 78 61 6d 70 6c 65 2c 20 74 68 65 20 65 71 75 61 |xample, the equa| 00000af0 74 69 6f 6e 20 6d 69 67 68 74 20 62 65 3a 0d 20 |tion might be:. | 00000b00 20 20 20 20 20 59 3d 2d 32 78 5e 32 2b 33 78 2d | Y=-2x^2+3x-| 00000b10 35 0d 0d 61 6e 64 20 69 6e 20 74 68 69 73 20 63 |5..and in this c| 00000b20 61 73 65 20 41 20 77 6f 75 6c 64 20 62 65 20 65 |ase A would be e| 00000b30 71 75 61 6c 20 74 6f 20 2d 32 2c 20 42 20 65 71 |qual to -2, B eq| 00000b40 75 61 6c 20 74 6f 20 33 20 61 6e 64 20 43 20 74 |ual to 3 and C t| 00000b50 6f 20 2d 35 2e 0d 20 20 20 59 6f 75 20 6d 75 73 |o -5.. You mus| 00000b60 74 20 6b 65 79 20 69 6e 20 74 68 72 65 65 20 6e |t key in three n| 00000b70 75 6d 62 65 72 73 20 61 6c 6c 20 61 74 20 6f 6e |umbers all at on| 00000b80 63 65 20 6f 6e 20 74 68 65 20 73 61 6d 65 20 6c |ce on the same l| 00000b90 69 6e 65 20 61 6e 64 20 73 65 70 61 2d 0d 72 61 |ine and sepa-.ra| 00000ba0 74 65 64 20 62 79 20 63 6f 6d 6d 61 73 2e 20 50 |ted by commas. P| 00000bb0 72 65 73 73 20 3c 52 45 54 55 52 4e 3e 20 6f 6e |ress <RETURN> on| 00000bc0 6c 79 20 61 66 74 65 72 20 79 6f 75 20 68 61 76 |ly after you hav| 00000bd0 65 20 6b 65 79 65 64 20 69 6e 20 61 6c 6c 20 74 |e keyed in all t| 00000be0 68 72 65 65 0d 6e 75 6d 62 65 72 73 2e 20 49 6e |hree.numbers. In| 00000bf0 20 74 68 65 20 65 78 61 6d 70 6c 65 20 61 62 6f | the example abo| 00000c00 76 65 2c 20 79 6f 75 20 77 6f 75 6c 64 20 6b 65 |ve, you would ke| 00000c10 79 20 69 6e 3a 0d 20 20 20 20 20 20 2d 32 2c 33 |y in:. -2,3| 00000c20 2c 2d 35 20 74 68 65 6e 20 3c 52 45 54 55 52 4e |,-5 then <RETURN| 00000c30 3e 0d 0d 54 68 65 6e 20 74 68 65 20 67 72 61 70 |>..Then the grap| 00000c40 68 20 6f 66 20 74 68 69 73 20 65 78 70 72 65 73 |h of this expres| 00000c50 73 69 6f 6e 20 69 73 20 64 72 61 77 6e 20 61 6e |sion is drawn an| 00000c60 64 20 79 6f 75 20 6d 75 73 74 20 6d 61 6b 65 20 |d you must make | 00000c70 61 6e 6f 74 68 65 72 0d 67 75 65 73 73 2e 20 49 |another.guess. I| 00000c80 66 20 79 6f 75 20 63 61 6e 6e 6f 74 20 67 75 65 |f you cannot gue| 00000c90 73 73 20 74 68 65 20 61 6e 73 77 65 72 2c 20 6b |ss the answer, k| 00000ca0 65 79 20 69 6e 3a 0d 20 20 20 20 20 20 57 48 41 |ey in:. WHA| 00000cb0 54 2c 49 53 2c 49 54 20 74 68 65 6e 20 3c 52 45 |T,IS,IT then <RE| 00000cc0 54 55 52 4e 3e 0d 0d 28 72 65 6d 65 6d 62 65 72 |TURN>..(remember| 00000cd0 20 74 6f 20 70 75 74 20 69 6e 20 74 68 65 20 63 | to put in the c| 00000ce0 6f 6d 6d 61 73 29 20 61 6e 64 20 79 6f 75 20 77 |ommas) and you w| 00000cf0 69 6c 6c 20 62 65 20 67 69 76 65 6e 20 74 68 65 |ill be given the| 00000d00 20 61 6e 73 77 65 72 20 61 6e 64 20 74 68 65 0d | answer and the.| 00000d10 70 72 6f 67 72 61 6d 20 65 6e 64 73 2e 0d 20 20 |program ends.. | 00000d20 20 49 66 20 79 6f 75 20 67 75 65 73 73 20 74 68 | If you guess th| 00000d30 65 20 61 6e 73 77 65 72 20 63 6f 72 72 65 63 74 |e answer correct| 00000d40 6c 79 20 74 68 65 6e 20 70 72 65 73 73 20 3c 45 |ly then press <E| 00000d50 53 43 41 50 45 3e 20 61 6e 64 20 61 20 6e 65 77 |SCAPE> and a new| 00000d60 20 67 72 61 70 68 0d 77 69 6c 6c 20 62 65 20 64 | graph.will be d| 00000d70 72 61 77 6e 2e 0d 20 20 20 49 74 20 69 73 20 6d |rawn.. It is m| 00000d80 6f 72 65 20 66 75 6e 20 74 6f 20 66 69 6e 64 20 |ore fun to find | 00000d90 6f 75 74 20 68 6f 77 20 74 6f 20 64 6f 20 69 74 |out how to do it| 00000da0 20 62 79 20 74 72 69 61 6c 20 61 6e 64 20 65 72 | by trial and er| 00000db0 72 6f 72 2c 20 62 75 74 20 69 66 0d 79 6f 75 20 |ror, but if.you | 00000dc0 77 61 6e 74 20 61 20 68 69 6e 74 20 74 68 65 6e |want a hint then| 00000dd0 20 74 68 69 73 20 69 73 20 69 74 2e 20 28 53 6b | this is it. (Sk| 00000de0 69 70 20 74 68 65 20 6e 65 78 74 20 70 61 72 61 |ip the next para| 00000df0 67 72 61 70 68 20 69 66 20 79 6f 75 20 64 6f 20 |graph if you do | 00000e00 6e 6f 74 0d 77 61 6e 74 20 74 6f 20 6b 6e 6f 77 |not.want to know| 00000e10 2e 29 0d 20 20 20 49 66 20 74 68 65 20 66 69 72 |.). If the fir| 00000e20 73 74 20 6e 75 6d 62 65 72 20 28 41 29 20 69 73 |st number (A) is| 00000e30 20 70 6f 73 69 74 69 76 65 2c 20 74 68 65 6e 20 | positive, then | 00000e40 74 68 65 20 67 72 61 70 68 20 77 69 6c 6c 20 70 |the graph will p| 00000e50 6f 69 6e 74 20 75 70 2d 0d 77 61 72 64 73 20 28 |oint up-.wards (| 00000e60 75 20 73 68 61 70 65 29 2c 20 61 6e 64 20 69 66 |u shape), and if| 00000e70 20 69 74 20 69 73 20 6e 65 67 61 74 69 76 65 2c | it is negative,| 00000e80 20 74 68 65 20 67 72 61 70 68 20 77 69 6c 6c 20 | the graph will | 00000e90 70 6f 69 6e 74 20 64 6f 77 6e 77 61 72 64 73 20 |point downwards | 00000ea0 0d 28 6e 20 73 68 61 70 65 29 2e 0d 0d 50 72 6f |.(n shape)...Pro| 00000eb0 67 72 61 6d 6d 69 6e 67 20 68 69 6e 74 73 0d 54 |gramming hints.T| 00000ec0 48 45 20 67 72 61 70 68 73 20 61 72 65 20 70 6c |HE graphs are pl| 00000ed0 6f 74 74 65 64 20 77 69 74 68 20 74 68 65 20 6f |otted with the o| 00000ee0 72 69 67 69 6e 20 28 7a 65 72 6f 2c 20 7a 65 72 |rigin (zero, zer| 00000ef0 6f 20 70 6f 69 6e 74 29 20 61 74 20 74 68 65 20 |o point) at the | 00000f00 6d 69 64 64 6c 65 0d 6f 66 20 74 68 65 20 73 63 |middle.of the sc| 00000f10 72 65 65 6e 20 62 79 20 75 73 69 6e 67 20 74 68 |reen by using th| 00000f20 65 20 56 44 55 20 73 74 61 74 65 6d 65 6e 74 20 |e VDU statement | 00000f30 69 6e 20 6c 69 6e 65 20 35 30 2e 20 54 68 69 73 |in line 50. This| 00000f40 20 73 61 76 65 73 20 61 20 6c 6f 74 20 6f 66 0d | saves a lot of.| 00000f50 75 6e 6e 65 63 65 73 73 61 72 79 20 6d 61 74 68 |unnecessary math| 00000f60 73 2e 0d 20 20 20 59 6f 75 20 63 6f 75 6c 64 20 |s.. You could | 00000f70 6d 61 6b 65 20 74 68 65 20 70 72 6f 67 72 61 6d |make the program| 00000f80 73 20 65 61 73 69 65 72 20 62 79 20 72 65 64 75 |s easier by redu| 00000f90 63 69 6e 67 20 74 68 65 20 72 61 6e 67 65 20 6f |cing the range o| 00000fa0 66 20 74 68 65 20 6e 75 6d 2d 0d 62 65 72 73 20 |f the num-.bers | 00000fb0 61 6c 6c 6f 77 65 64 2e 20 44 6f 20 74 68 69 73 |allowed. Do this| 00000fc0 20 62 79 20 72 65 64 75 63 69 6e 67 20 74 68 65 | by reducing the| 00000fd0 20 35 20 69 6e 20 6c 69 6e 65 20 32 38 30 20 6f | 5 in line 280 o| 00000fe0 72 20 74 68 65 20 39 20 69 6e 20 6c 69 6e 65 20 |r the 9 in line | 00000ff0 32 39 30 0d 6f 72 20 62 6f 74 68 2e 20 49 66 20 |290.or both. If | 00001000 79 6f 75 20 77 61 6e 74 20 74 6f 20 6d 61 6b 65 |you want to make| 00001010 20 69 74 20 76 65 72 79 20 65 61 73 79 20 79 6f | it very easy yo| 00001020 75 20 63 61 6e 20 61 6c 6c 6f 77 20 6f 6e 6c 79 |u can allow only| 00001030 20 70 6f 73 69 74 69 76 65 20 0d 6e 75 6d 62 65 | positive .numbe| 00001040 72 73 20 62 79 20 64 65 6c 65 74 69 6e 67 20 6c |rs by deleting l| 00001050 69 6e 65 20 33 30 30 2e 0d 20 20 20 54 68 65 20 |ine 300.. The | 00001060 70 72 6f 67 72 61 6d 20 75 73 65 73 20 4d 6f 64 |program uses Mod| 00001070 65 20 31 20 74 6f 20 65 6e 61 62 6c 65 20 67 75 |e 1 to enable gu| 00001080 65 73 73 65 64 20 67 72 61 70 68 73 20 74 6f 20 |essed graphs to | 00001090 62 65 20 64 69 73 70 6c 61 79 65 64 20 69 6e 20 |be displayed in | 000010a0 0d 72 65 64 2c 20 61 6e 64 20 74 68 65 20 74 61 |.red, and the ta| 000010b0 72 67 65 74 20 67 72 61 70 68 20 69 6e 20 77 68 |rget graph in wh| 000010c0 69 74 65 2e 20 4f 6e 20 61 20 42 42 43 20 4d 6f |ite. On a BBC Mo| 000010d0 64 65 6c 20 41 2c 20 79 6f 75 20 77 69 6c 6c 20 |del A, you will | 000010e0 6e 65 65 64 20 74 6f 20 0d 63 68 61 6e 67 65 20 |need to .change | 000010f0 6c 69 6e 65 20 34 30 20 74 6f 20 4d 6f 64 65 20 |line 40 to Mode | 00001100 31 2e 20 54 68 65 20 70 72 6f 67 72 61 6d 20 74 |1. The program t| 00001110 68 65 6e 20 72 75 6e 73 20 77 69 74 68 6f 75 74 |hen runs without| 00001120 20 63 6f 6c 6f 75 72 2e 0d 20 20 20 20 20 20 20 | colour.. | 00001130 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00001150 20 20 20 20 20 20 47 65 6e 65 76 69 65 76 65 20 | Genevieve | 00001160 4c 75 64 69 6e 73 6b 69 2c 20 45 55 47 20 23 35 |Ludinski, EUG #5| 00001170 35 0d |5.| 00001172
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