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2.1 Programs

Visual Studio .NET 2003

A C# program consists of one or more source files, known formally as compilation units (Section 9.1). A source file is an ordered sequence of Unicode characters. Source files typically have a one-to-one correspondence with files in a file system, but this correspondence is not required. For maximal portability, it is recommended that files in a file system be encoded with the UTF-8 encoding.

Conceptually speaking, a program is compiled using three steps:

  • Transformation, which converts a file from a particular character repertoire and encoding scheme into a sequence of Unicode characters.
  • Lexical analysis, which translates a stream of Unicode input characters into a stream of tokens.
  • Syntactic analysis, which translates the stream of tokens into executable code.
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