This book is a collection of practical problems in the C++ 17 language: from mathematical and computational to architectural, built on the basis of design templates. Here are 100 tasks that will help you put into practice the diverse capabilities of C++ and its standard library, as well as try out many third-party, cross-platform libraries. Solutions are presented in the form of source code, explanations and recommendations for it. The book is recommended by the C++ developer community in Russia and Belarus. The publication will be useful for students of technical universities, as well as beginners and experienced developers.