NEW
1.
REM
***
LOVELACE,
ClZ
***
5
PRINT"
'"
"
1.9
PRINT:
PRINT
"ADA
LOVELACE
..
DAUGHTER
OF
THE
POET
LORD
BYRON
..
WAS
MATHEMATICALL
Y
BRILLIANT,
"
29
PRINT
39
PRINT
"IN
WHAT
YEAR
DID
SHE
WRITE
HER
AMAZINGLY
ACCURATE
DESCRIPTION
OF
THE
FUTURE
USES
OF
THE
COMPUTER";
49
TRAP
299
59
INPUT
GUESS
69
IF
GUESS=1.842
THEN
GOTO
1.99
79
IF
GUESS(1.842
THEN
GOTO
1.1.9
89
IF
GUESS}1.842
THEN
GOTO
1.29
1.99
PRINT:
PRINT
"CONGRATULATIONS!
YOU
GUESSED
THE
YEAR
CORRECTLY,":END
1.1.9
PRINT:
PRINT
"THAT
WAS
TOO
EARL
y,
TRY
AGAIN,
" :
GOTO
29
1.29
PRINT:
PRINT"
THAT
WAS
TOO
LATE,
TRY
AGAIN,
" :
GOTO
29
299
PRINT:
PRINT
"PLEASE
ENTER
A
NUMBER
ONLY,
"
21.9
GOTO
29
In
th
e Lovelace Quiz, the placement of the PRINT messages
associated with the IF-THEN statements is different from their place-
ment
in
the Brainprobe Quiz and the Number Quiz.
Thi
s difference
illustrates that the
re
is often more th
an
one way to achieve the same
results
in
programmin
g.
computer Bugs
The TRAP statement makes the Lovelace Quiz more errorproof, but it
still
is
not perfect. Because the computer evaluates the date as a
number, it will accept 1842.78
as
incorrect but 1842,78 as correct.
Most programs have " bugs," or problems. When you can figure out
the bugs and
fi
x them, you have
rea
ll
y learned to program. Every
beginner encounters many bugs and makes many mistakes.
To
become a better programmer, study this manual, refer to t
he
ATARI
BASIC
Reference
Guide, and perhaps have a more experienced
person
look over your shoulder occasionally. You will learn how to
identify bugs so that you can avoid simi lar mistakes
in
future
programs.
FOR·NEXT
LOOP:
THE COUNTING LOOP
You are already familiar with the infinite GOTO loop. Another kind of
loop is the FOR-NEXT loop. The FOR-NEXT loop is a counting loop,
which is not infinite. Type NEW and enter the following program:
57
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