puzzle answers

e 15
nam and message program
MINPUTNS O,
€, PRINT »HOW ARE YOU"

Page 17
1. Sums program

. Tables program v 7 Sodi
9% PRINT A;" TIMES ";B;" IS ",AxB
4% PRINT A:" DIVIDEDBY ";B;" IS" ,A/B

alterations -

) PRINT "WHAT IS YOUR NAME"

Page 18
Sums program

0 PRINT "WHAT IS 7 TIMES 7"
) INPUT A
0 IF A-49 THEN PRINT "CORRECT"
) IF A<>49 THEN PRINT "NO":7x7
f
You need a semi-colon after the
- guotes, like this.

dage 19
Je guessing game
place line 30 and add a new line 35:

IF G<14 THEN PRINT "O

LD
HAN THAT je
IF G>14 THEN PRINT "YOUNGER
THAN THAT" UN

"me

Page 23
Plotting counter
5 LET C-0

45 LET C<-Ct]
50 IF C<6 THEN GOTO 10

Plotting your initial
Here is an example of a program to plot

Page 24
Random numbers

The formula for a random number
between 10 and 20 would be
INT(RND(1)x 11-4-9). On computers which
need only a number in bracketsafter

20 so you need to pick random numbers
between | and ll, thenadd 9.

Page 25

Space attack

These are the lines you need to addto
count the number of hits:

1$ LET S—0

15 IF X—AxB THEN LET S-<-S:]1
95 PRINT "YOU HIT "

Page 27
1. Eight times table

10 PRINT "THE EIGHT TIMES TABLE"
20 FOR J<l TO 12

30 PRINT J;"x8<";]a8

40 NEXT J

Page 27
2. Ntimes table

10 INPUT "TYPE IN A NUMBER";N
20 PRINT "HERE IS THE "

:N;" TIMES TABLE"
30 FOR I-l TO 12
40 PRINT 1;" TIMES ";N;" IS ";laN
50 NEXT |

60 INPUT "ANOTHER NUMBER (Y or N)"

"M$
70 IF M$-"Y" THEN GOTO 10
For the ZX81 you need separate PRINT
and INPUT lines.

Page 32

Computer book string puzzle
LEFT$(A$,8) is "COMPUTER"
RIGHT$(A$,10) is "PUTER BOOK"
MID$(A$,5,8) is "UTER BOO"

Space invaders repeat program

W STEP W/6

Copy out the pattern repeat program,
excluding lines 10 to 40 and 90 to 140, as
shown above. (These lines produce the
random pattern for the program so you do
not need them.)

Now you need to put your own plot lines

Page 34
Number trick program

10 PRINT "THINK OF A NUMBER"

20 PRINT "DOUBLE IT, ADD 4'

30 PRINT "DIVIDE BY 2, ADD T'

40 PRINT "MULTIPLY BY 8,
SUBTRACT 12"

50 PRINT "DIVIDE BY 4 AND TAKE
AWAY 11"

60 PRINT "TELL ME THE RESULT"

70 INPUT N

B0 PRINT "THE NUMBER YOU FIRST
THOUGHT OF IS";(N-4Y2

2 4,5; 5,5; 6,5
3,4 5,4; 7,4
4,3; 5,3; 6,3
3,2; 4,2; 6,2: 7.2
Then work out the co-ordinates ol all the

sguares which make up the space
invader.

INPUT "HOW na
mo Change the 6toa higher figure to increase the nannuro!
zam oda V STEP V/ [- ceta bug ov ave made be number oba)

Put lot lines here, e.g.
ej TET
14,
jor the two bonom lefi-hand sguares of the

8