The book is dedicated to developing applications for Windows, Mac OS X, Linux, Android and iOS using the Qt library version 5.10. The capabilities provided by this library are discussed in detail, and features are described that distinguish it from other libraries. Describes the Qt Creator integrated development environment and how to work with Qt Quick technology. The book contains comprehensive information on Qt 5 classes, and practical recommendations for their application are also given, illustrated by a large number of detailed examples. Projects of examples from the book are posted on the publisher's website.