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首页C#入门经典2008习题详解：变量表达式与命名规范

C#入门经典2008习题详解：变量表达式与命名规范

c#入门经典2008

习题答案

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在"C#入门经典2008"这本书的习题解答部分，提供了针对初学者的实践指导。以下是各章节的主要知识点： 1. **Chapter 1: Introducing C#** - 本章可能侧重于C#语言的基本介绍，包括语法、类和对象的概念，但并未提供具体的练习题目。对于初学者来说，这部分可能会涵盖C#的历史、特点以及它在.NET框架中的地位。 2. **Chapter 2: Writing a C# Program** - 这章可能是关于编写C#程序的基础，包括如何设置开发环境、声明变量、编写控制结构（如循环和条件语句）等。尽管没有列出具体练习，但读者可以在此基础上通过解决简单的编程任务来巩固基础知识。 3. **Chapter 3: Variables and Expressions** - 提供了几个与变量和表达式相关的习题： - Exercise 1Q: 考查命名空间的引用规则，提示读者在命名空间嵌套时如何正确地引用特定名称。答案是`super.smashing.great`，强调了使用完整的命名空间路径。 - Exercise 2Q: 验证非法变量名的识别，指出以数字开头和包含全点的选项`b`是不合法的，因为C#变量名不能以数字或特殊字符开头。 - Exercise 3Q: 探讨字符串大小限制，说明理论上C#没有大小限制，允许创建任意长度的字符串变量，除非内存不足。 4. **Exercise 4Q**: 涉及运算符优先级的理解和表达式计算步骤，要求按照运算符的优先级对给定表达式`resultVar += var1 * var2 + var3 % var4 / var5`进行分析。答案涉及先乘除后加减，以及使用括号明确优先级。这些习题旨在帮助读者通过实际操作理解C#的关键概念，包括命名空间、变量命名规则、字符串处理和运算符优先级。通过解答这些问题，读者可以加深对C#语言的理解，提升编程技能。同时，这也可以作为学习者在阅读理论知识后检验自己理解和应用能力的重要工具。

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Exercise 5

Q. Write some code for a function that would accept either of the two cup objects in the above

example as a parameter. The function should call the

AddMilk(), Drink(), and Wash()

methods for and cup object it is passed.

static void ManipulateDrink(HotDrink drink)

{

drink.AddMilk();

drink.Drink();

ICup cupInterface = (ICup)drink;

cupInterface.Wash();

}

Note the explicit cast to ICup. This is necessary because HotDrink doesn’t support the ICup

interface, but we know that the two cup objects that might be passed to this function do. However,

this is dangerous because other classes deriving from

HotDrink are possible, which might not

support

ICup, but could be passed to this function. To correct this, check to see if the interface is

supported:

static void ManipulateDrink(HotDrink drink)

{

drink.AddMilk();

drink.Drink();

if (drink is ICup)

{

ICup cupInterface = drink as ICup;

cupInterface.Wash();

}

The is and as operators used here are covered in Chapter 11.

Chapter 9: Defining Classes

Exercise 1

Q. What is wrong with the following code?

public sealed class MyClass

{

// Class members.

}

public class myDerivedClass : MyClass

{

// Class members.

}

A. myDerivedClass derives from MyClass, but MyClass is sealed and can’t be derived from.

Exercise 2

Q. How would you define a noncreatable class?

A. By defining it as a static class or by defining all of its constructors as private.

Exercise 3

Q. Why are noncreatable classes still useful? How do you make use of their capabilities?

A. Noncreatable classes can be useful through the static members they possess. In fact, you can even

get instances of these classes through these members. Here’s an example:

class CreateMe

{

private CreateMe()

{

}

static public CreateMe GetCreateMe()

{

return new CreateMe();

}

Here the public constructor has access to the private constructor as it is part of the same class

definition.

Exercise 4

Q. Write code in a class library project called Vehicles that implements the

Vehicle family of

objects discussed earlier in this chapter, in the section on interfaces versus abstract classes. There

are nine objects and two interfaces that reQuire implementation.

A. For simplicity, the following class definitions are shown as part of a single code file rather than

listing a separate code file for each.

namespace Vehicles

{

public abstract class Vehicle

{

}

public abstract class Car : Vehicle

{

}

public abstract class Train : Vehicle

{

}

public interface IPassengerCarrier

{

}

public interface IHeavyLoadCarrier

{

}

public class SUV : Car, IPassengerCarrier

{

}

public class Pickup : Car, IPassengerCarrier, IHeavyLoadCarrier

{

}

public class Compact : Car, IPassengerCarrier

{

}

public class PassengerTrain : Train, IPassengerCarrier

{

}

public class FreightTrain : Train, IHeavyLoadCarrier

{

}

public class T424DoubleBogey : Train, IHeavyLoadCarrier

{

}

Exercise 5

Q. Create a console application project, Traffic, that references

Vehicles.dll (created in Exercise

4). Include a function,

AddPassenger(), that accepts any object with the

IPassengerCarrier interface. To prove that the code works, call this function using instances

of each object that supports this interface, calling the

ToString() method inherited from

System.Object on each one and writing the result to the screen.

using System;

using Vehicles;

namespace Traffic

{

class Program

{

static void Main(string[] args)

{

AddPassenger(new Compact());

AddPassenger(new SUV());

AddPassenger(new Pickup());

AddPassenger(new PassengerTrain());

}

static void AddPassenger(IPassengerCarrier Vehicle)

{

Console.WriteLine(Vehicle.ToString());

}

Chapter 10: Defining Class Members

Exercise 1

Q. Write code that defines a base class,

MyClass, with the virtual method GetString(). This

method should return the string stored in the protected field myString, accessible through the

write only public property

ContainedString.

class MyClass

{

protected string myString;

public string ContainedString

{

set

{

myString = value;

}

public virtual string GetString()

{

return myString;

}

Exercise 2

Q. Derive a class,

MyDerivedClass, from MyClass. Override the GetString() method to

return the string from the base class using the base implementation of the method, but add the text

" (output from derived class)" to the returned string.

class MyDerivedClass : MyClass

{

public override string GetString()

{

return base.GetString() + " (output from derived class)";

}

Exercise 3

Q. Partial method definitions must use the

void return type. Give a reason why this might be so.

A. If a method has a return type, then it is possible to use it as part of an expression; for example:

x = Manipulate(y, z);

If no implementation is provided for a partial method, it will be removed by the compiler along

with all places where it is used. In this code that would leave the result of

x unclear because there

is no replacement for the

Manipulate() method available. It may be the case that without this

method you would simply want to ignore the entire line of code, but the compiler is not capable of

deciding whether this is what you’d want.

Methods with no return types are not called as part of expressions, so it is safe for the compiler to

remove all references to the partial method calls.

Similarly,

out parameters are forbidden because variables used as an out parameter must be

undefined before the method call and will be defined after the method call. Removing the method

call would break this behavior.

Exercise 4

Q. Write a class called

MyCopyableClass that is capable of returning a copy of itself using the

method

GetCopy(). This method should use the MemberwiseClone() method inherited from

System.Object. Add a simple property to the class, and write client code that uses the class to

check that everything is working.

class MyCopyableClass

{

protected int myInt;

剩余77页未读，继续阅读

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