PEARSON EDEXCEL INTERNATIONAL GCSE(9-1)COMPUTER SCIENCEStudent BookeBookDavid Waller●PearsonPEARSON EDEXCEL INTERNATIONALGCSE(9-1)COMPUTER SCIENCEStudent BookDavid WallerChris CharlesPete DringAlex Hadwen-BennettJason WelchShaun WhortonSERIES EDITORAnn WeidmannPublished by Pearson Education Limited,80 Strand,London,WC2R ORL.Endorsement statementIn order to ensure that this resource offers high-quality support for the associatedhttps://www.pearson.com/intemational-schoolsPearson qualification,it has been through a review process by the awardingCopies of official specifications for all Pearson Edexcel qualifications may be foundleaming content of the specification at which it is aimed.It also confirmthat itDesigned by Pearson Education Limited 2020Endorsement does not cover ary guidance on assessment activities or processesTypeset by SPi Global(e.g-practice questions or advice on how to answer assessment questions)Edited by Hillary Coaster and Sarah Wrightteaching or delivery of a related course.Cover design Pearson Education Limited 2020While the publishers have made every attempt to ensure that advice on theWith thanks to Sam Hartburnqualfication and its assessment is accurate,the official specification andassociated assessment guidance materials are the only authoritative source ofThe right of David Waller,Chris Charles,Pete Dring.Alex Hadwen-Bennett.Jasorinformation and should always be referred to for definitive guidanceasserted by them in accordance with the Copyright,Designs and Patents Act 1988.Pearson examiners have not contributed to any sections in this resource relevant toexamination papers for which they have responsibility.First published 2020Examiners will not use endorsed resources as a source of material for any222120assessment set by Pearson.Endorsement of a resource does not mean that the10987654321resource is required to achieve this Pearson qualification,nor does it mean that itis the only suitable material available to support the qualification,and any resourceBritish Library Cataloguing in Publication Datalists produced by the awarding body shall include this and other appropriateA catalogue record for this book is avalable from the British Libraryresources.ISBN9781292310220Copyright noticeAll rights reserved.No part of this publication may be reproduced in amy form or byany means (including photocopying or storing it in any medium by electronic meansprovisions of the Copyright.Designs and Patents Act 1988 or under the terms of aowner's written permission should be addressed to the publisher.Printed in Slovakia by NeografiaAcknowledgementsText CreditsLoon LLC:Extracts from Loon LLC.Loon LLC,256:McKinsey Company:Stefan Heck,Sri Kasa,Dickon Pinner.Creating Value in the Semiconductorindustry,2011.McKinsey Company.264.Image Credits(key:b-bottom;c-center:I-left;r-right:t-top)Cover Image:Shutterstock/PopTika123RF:Anton Starikow/123RF 160bc,Jan Miks/123RF 54,Kbuntu/123RF 214,123RF 69:Alamy Stock Photo:Jonathan Ball/Alamy Stock Photo 168r.MartinMoxter/imageBROKER/Alamy Stock Photo 248.Paul Broadbent/Alamy StockPhoto 1681,Richard Levine/Alamy Stock Photo 52t,Stuart Kinlough/AlamyStock Photo 2,32,108.158,200,242:Python Software Foundation:Copyright2001-2019.Python Software Foundation 51,94,96,101:Shutterstock:Adisa/Shutterstock 160tl,Asharkyu/Shutterstock 245,Anton Gvozdikow/Shutterstock 265,Burlingham/Shutterstock 34.Baloncici/Shutterstock 106,vil,Bloomicon/Shutterstock 160br,Brian A Jackson/Shutterstock 175,226,Brainpencil/Crisp/Shutterstock 185,Cybrain/Shutterstock 267t,Cobalt88/Shutterstock 234,DavidTB/Shutterstock 24,Dja65/Shutterstock 160tc,D-VISIONS/Shutterstock 163manShutterstock 37.Joshua Davenport/Shutterstock 7,Kavione/Shutterstock 160tr.Michaeljung/Shutterstock 65,Mmaxer/Shutterstock 219,Moomchak V.Design/Shutterstock 268b,Nito/Shutterstock 17,Nkita G.Bemadsky/Shutterstock 266b,Nobeastsofierce/Shutterstock 267b,OlegDoroshin/Shutterstock 5,vil,Platslee/Shutterstock 129,142.Pakhnyushchy/Shutterstock 160cl,Pho