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DRE ea,
The year is 2582 and the tha lie ana
midst of battle against the Robots. A lethal Robot ,0 PRINT "ROBOT MISSILE" These lines print the

|. Missile has just landed and everyoneisdepending .- .
on you to find the secret code which unločkgits.. ;-:5%:% 30 PRINT "TYPE THE CORRECT CODE
defuse mechanism. Ifyou fail, the entire Eartli 4:4 %% 20 PRINT "LETTER lez) TO, |
Command Headguarters will be blown em 50 PRINT "DEFUSE -

ra 60 PRINT "YOU HAVE 4 CHANCES
70 PRINT

Your computer knows what the code
letter is. You must type in your guessand
it will tell you whether the code letter

This selects a number

You have four chances to find the to a letter (the "secret code")
correct letter before the missile

Line 90 begins a loop which
makes lines 100-140 repeat 4
times.

90 FOR Gz<1 TO 4
100 INPUT G$%

$—C$ THEN GOTO 210 ooooo— Check if your letter is the
NAM ge V same as the "secret code" in

C£. Iso computer jumps to 210.
Check if secret code letter is

120 IF G$<C$ THEN PRINT "LATER";
130 IF G$>C$ THEN PRINT "EARLIER";
140 PRINT " THAN ";G$

1

ami

150 NEXT G

160 PRINT
170 PRINT "BOOOOOOOOMMM..."

180 PRINT "YOU BLEW IT."

190 PRINT "THE CORRECT CODE WAS";5C$
200 STOP

210 PRINT veubib rove]

220 PRINT "YOU DID IT"
230 STOP

The above listing will work on a ZX81. For

other computerz, make the changes below.

£aO68O LET C$<CHR$ (G41INT(RND(1)826t:1))
SO LET CS<CHR$ (64: INT(RND(O) €26t1))
sBO LET C$<CHR$ (44:INT (RND 82611)»

ne udi as,
tod

Adding to the program

You can make the computer print an
extra message for a correct guess on the
last go. Change line 220 by addinga
semicolon to it, like this:

See if you can work out how to change
the program to give you mare or leus
chances of guemsing the code latter.