CS Basics: Input Process Output | Mr Matthews | YouTubeToText
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everybody has seen a computer in fact we
use computers every day but how do they
work every computer follows a simple
series of events that helps make them
useful this starts with an input an
input is any information that goes into
a computer this might be the press of a
key a click of a button
video from a camera or even the
temperature of a thermometer devices
that provide information to a computer
are called input devices once the
computer has received this input it
spends a tiny fraction of a second
calculating what this information means
and how or need to respond this is
called processing and is done in the
computer system central processing unit
or CPU as soon as it finishes working
this out the computer often lets us know
by producing an output an output is a
way for the computer to communicate with
the outside world
this can include sounds pictures on a
screen or even movement over a robotic
part devices that a computer system used
to communicate are called output devices
you might be thinking ok that seems
pretty reasonable but how does a
computer know what to do
this is where programming comes into
play all computers use a special set of
instructions called programs that help
them to decide what to do these can be
very simple like in a calculator or very
complex like in a supercomputer and
without them your computer is a little
more than a brick the final part of the
puzzle is storage storage is used to
keep information for later use sometimes
data must be saved to storage and at
other times it needs to be retrieved
from storage devices that hold
information are called storage devices
in essence this is how a computer works
but let's look at some examples let's
say your video calling a friend the
input to your laptop is the video and
audio going through the webcam the
computer then processes the video and
audio breaking it into parts to send to
your friend when it reaches your
friend's computer its output onto their
screen as video and through their
speeches as audio but wait where did all
these special effects come from when
making the call you decided to play with
the video calling program and add some
filters to your video
this means a bit more work for the
processor but it's a lot more fun the
images for the filters are kept on your
computer storage and are opened as you
add them to the stream as another
example let's look at a calculator let's
say you press the 2 button on your
calculator this is the input the
calculator spends a fraction of a second
processing what it needs to do
then displays the number two on a screen
as an output if this seems a little
complicated you can think of it like
this input is how computer gets
information from the world allowing us
to communicate with the computer
processing is the computer calculating
order should do next output is the way
the computer can communicate with the
outside world including us programming
is the instructions given to a computer
so it knows how to process information
and storage is how a computer keeps
information for later use see if you can
think of some examples of input
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