C# 7.0实战：EPUB转PDF自主编辑教程

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"《Essential C# 7.0 根据EPUB导出并编辑》是一本介绍C# 7.0编程语言的教程，适合已有C、C++或Java经验的程序员阅读。作者利用英语版的EPUB格式书籍，首先从经典的"Hello World"程序入手，引导读者了解C#的基本语法、结构和执行环境——即管理执行上下文。章节内容包括如何定义程序入口点、变量声明与操作、控制台输入输出以及代码注释的基本用法。 C#语言设计始于1998年的第一次会议，其发展继承了C-style语言（如C、C++）的部分特性，使其易于上手，并且能够在多种操作系统平台上运行。学习者通过编写简单的程序，逐步熟悉C#的语法，如定义函数、声明变量、处理控制流程等。"Hello World"程序作为学习新语言的起点，展示了如何输出字符串"HELLO, WORLD!"到控制台，这是每个初学者接触编程时必不可少的第一课。此外，书中还强调了在C#中进行代码注释的重要性，这对于理解代码逻辑和协作开发至关重要。值得注意的是，作者提到使用的资源并非最终版本，因为封面标注有"ROUGH CUTS"，意味着可能存在未完成或临时性的内容。尽管如此，这份经过作者精心编辑的PDF版本仍具有很高的实用价值，可以直接打印供个人学习和参考。《Essential C# 7.0》是一个理想的资源，对于想要深入理解C# 7.0的开发者来说，无论是基础入门还是进阶学习，都能从中获益匪浅。通过阅读和实践章节中的示例，读者能够快速掌握C#的核心概念，并将其应用于实际项目开发中。"

Advanced Topic

Statements without Semicolons

Many programming elements in C# end with a semicolon. One example that does

not include the semicolon is a

switch

statement. Because curly braces are always

included in a switch statement, C# does not require a semicolon following the

statement. In fact, code blocks themselves are considered statements (they are also

composed of statements) and they don’t require closure using a semicolon.

Similarly, there are cases, such as the using declarative, in which a semicolon

occurs at the end but it is not a statement.

Since creation of a newline does not separate statements, you can place multiple

statements on the same line and the C# compiler will interpret the line as having

multiple instructions. For example, Listing 1.6 contains two statements on a single

line that, in combination, display Up and Down on two separate lines.

LISTING 1.6: Multiple Statements on One Line

System.Console.WriteLine("Up");System.Console.WriteLine("Down");

C# also allows the splitting of a statement across multiple lines. Again, the C#

compiler looks for a semicolon to indicate the end of a statement (see Listing 1.7).

LISTING 1.7: Splitting a Single Statement across Multiple Lines

System.Console.WriteLine(

"Hello. My name is Inigo Montoya.");

In Listing 1.7, the original WriteLine() statement from the HelloWorld program is

split across multiple lines.

Beginner Topic

What Is Whitespace?

Whitespace is the combination of one or more consecutive formatting characters

such as tab, space, and newline characters. Eliminating all whitespace between

words is obviously significant, as is including whitespace within a quoted string.

Whitespace

The semicolon makes it possible for the C# compiler to ignore whitespace in code.

Apart from a few exceptions, C# allows developers to insert whitespace throughout

the code without altering its semantic meaning. In Listing 1.6 and Listing 1.7, it didn’t

matter whether a newline was inserted within a statement or between statements,

and doing so had no effect on the resultant executable created by the compiler.

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