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The yield contextual keyword is used with an iterator, which is a method, operator, or accessor that returns the members of a set of objects, one element at a time, in sequence Iterators are most often used with collections
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C# 30: A Beginner s Guide
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The extern keyword has two uses First, it indicates that a method is provided by external code, which is usually unmanaged code Second, it is used to create an alias for an external assembly
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Congratulations! If you have read and worked through all the 15 chapters, then you can call yourself a C# programmer Of course, there are still many, many things to learn about C#, its libraries, and subsystems, but you now have a solid foundation upon which you can build your knowledge and expertise Here are a few of the topics that you will want to learn more about:
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To continue your study of C#, I recommend my book C# 30: The Complete Reference (McGraw-Hill)
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15 Self Test
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1 Name the preprocessor directives that are used for conditional compilation 2 What does #elif do 3 How can you obtain a SystemType instance that represents the type of an object at runtime 4 What does is do 5 What benefit does as provide 6 Show how to declare a nullable int called count that is initialized to null 7 A nullable type can represent all values of its underlying type, plus the null value True or
False
8 What is the operator called and what does it do 9 What is unsafe code 10 Show how to declare a pointer to a double Call the pointer ptr 11 Show the attribute syntax
15:
The Preprocessor, RTTI, Nullable Types, and Other Advanced Topics
12 What are the two kinds of conversion operators Show their general forms 13 What is a collection What namespace are the generic collections in 14 What interface is implemented by all generic collections 15 What keyword is used to declare a partial class What keyword is used to declare a partial
method
16 On your own, continue to explore and experiment with C#
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Appendix
Answers to Self Tests
Copyright 2009 by The McGraw-Hill Companies Click here for terms of use
C# 30: A Beginner s Guide
1: C# Fundamentals
1 MSIL stands for Microsoft Intermediate Language It is an optimized, portable set of assembly language instructions that is compiled into executable code by a JIT compiler MSIL helps C# achieve portability, security, and mixed-language compatibility 2 The Common Language Runtime (CLR) is the part of NET that manages the execution of C# and other NET-compatible programs 3 Encapsulation, polymorphism, and inheritance 4 C# programs begin execution at Main( ) 5 A variable is a named memory location The contents of a variable can be changed during the execution of a program A namespace is a declarative region Namespaces help keep one set of names separate from another 6 The invalid variables are B and D Variable names cannot begin with a $ or a digit 7 A single-line comment begins with // and ends at the end of the line A multiline comment begins with /* and ends with */ 8 The general form of the if: if(condition) statement; The general form of the for: for(initialization; condition; iteration) statement; 9 A block of code begins with a { and ends with a } 10 No, using System is not necessary, but leaving it out means that you must fully qualify members of the System namespace by putting System in front of them 11 //
Compute your weight on the moon
using System; class Moon { static void Main() { double earthweight; // weight on earth double moonweight; // weight on moon earthweight = 1650; moonweight = earthweight * 017; ConsoleWriteLine(earthweight + " earth-pounds is equivalent to " + moonweight + " moon-pounds"); } }
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