Book Image

Learn C# Programming

By : Marius Bancila, Raffaele Rialdi, Ankit Sharma
5 (1)
Book Image

Learn C# Programming

5 (1)
By: Marius Bancila, Raffaele Rialdi, Ankit Sharma

Overview of this book

The C# programming language is often developers’ primary choice for creating a wide range of applications for desktop, cloud, and mobile. In nearly two decades of its existence, C# has evolved from a general-purpose, object-oriented language to a multi-paradigm language with impressive features. This book will take you through C# from the ground up in a step-by-step manner. You'll start with the building blocks of C#, which include basic data types, variables, strings, arrays, operators, control statements, and loops. Once comfortable with the basics, you'll then progress to learning object-oriented programming concepts such as classes and structures, objects, interfaces, and abstraction. Generics, functional programming, dynamic, and asynchronous programming are covered in detail. This book also takes you through regular expressions, reflection, memory management, pattern matching, exceptions, and many other advanced topics. As you advance, you'll explore the .NET Core 3 framework and learn how to use the dotnet command-line interface (CLI), consume NuGet packages, develop for Linux, and migrate apps built with .NET Framework. Finally, you'll understand how to run unit tests with the Microsoft unit testing frameworks available in Visual Studio. By the end of this book, you’ll be well-versed with the essentials of the C# language and be ready to start creating apps with it.
Table of Contents (20 chapters)

Chapter 2

  1. The built-in integral types in C# are byte, sbyte, ushort, short, uint, int, ulong, and long.
  2. The float and double types represent numbers using the inverse powers of 2 for the fractional part. Therefore, they cannot represent exactly numbers such as 1.23 or 19.99, but only an approximation of them. Although double has 15 digits of precision, compared to float, which has only 7; precision loss accumulates when performing repeated calculations. The decimal type uses a decimal representation of real numbers, which is much slower to compute, but provides better precision. The decimal type has 28 digits of precision and is suitable for categories of applications, such as financial applications, where this is key.
  3. Strings can be concatenated using the + operator. Apart from concatenation, you can compose strings using the String.Format() static method, or with string interpolation, which is a syntactic shortcut for this method.
  4. Some characters have a special meaning...