Introduction_to_Computer_Programming_BASIC_for_Beginners.pdf

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I
INTRODUCTION TO
COMPUTER
P.RDIi
M Ii
BASIC for beginners
Usborne Hayes Electronics
INTRODUCTION TO
COMPUTER
PROIiRAMMII\lIi
Brian Reffin Smith
Edited by Lisa Watts
Designed by Kim Blundell
Illustrated by Graham Round
and Martin Newton
Contents
4
How
a computer
works
6 Giving the computer
instructions
8 Writing programs
10 First words
in
BASIC
12 Giving the computer information
14 Using INPUT
16 Doing things
with
PRINT
18 How computers compare things
20
Programs
with
lots of BASIC
22
Drawing
pictures
24
Playing games
26 Making loops
28
Tricks
with
loops
30
Subroutines
32 Doing things with words
34
Graphs and symbols
36
More graphics
38 Funny
poems
program
42 Programming tips
44
Puzzle answers
46 BASIC words
48 Going further and Index
j
2
I
I
·1
~
,
About this book
This
is a gUIde
to
writing computer
programs
in BASIC for absolute
beginners.
BASIC is the language
used
on most
home
computers.
It
is
a
way
ofwritmg
instructions for
a
computer
m a form the computer
can
understand.
To
give
you
some
practice in
writing
programs there
are
program puzzles to
solve and
suggestlOns
for programs to
write
and for useful alterations
you can
make to the programs in
this
guide
The
answers
to
the
program
puzzles
are
on pages
44-45.
At
the end
of
the
guide
there
is a
list
of
BASIC terms
and other
computer words with
brief
explanations.
There
are also some
gUldelines to help
you write
programs,
and a
llst of
"bugs" - the
mIstakes in
programs
which
stop
them working - with hmts to help
you
recognize them.
You do not need
a computer
to
use
this
guide,
though
of course
it
helps
you
to understand
the
programs if
you can
try
them out on
a
computer. Different
makes
of
computer
use
slightly
different
verSlOns ofBASIG
Nearly
all the
terms in thIS book, though,
will
work on
most microcomputers,
and
the few that
are
not standard are
clearly marked.
If
you
have
a micro,
tryout the
At the
beginnmg
there
are some
guidelines
to
programming
a
computer. Then, as
you
read
through the
book,
the main BASIC
words
are introduced one by
one,
with short
programs to show
how
they
work.
programs in thIS guide, then, to find
out
more
about
how your mICro
works,
look up
the
BASIC terms in
your manual. You
may
find
that
some of the
rules
given
here
are
not necessary
on your
micro. The
best
way
to learn BASIC
IS
to tryout
lots
of
programs from
books and
magazines,
then alter
them
a
little
to see wha
t happens. From there
you
wlll soon
be wnting
your
own
programs.
3

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