public class cnew { public bool Status { get; set; } public bool Can() { Status = true; Console.WriteLine(Status); return Status; } public static void Main() { cnew.Can(); } }
时间: 2024-02-14 16:06:21 浏览: 26
这是一个 C# 程序,它定义了一个名为 cnew 的类,该类具有一个名为 Status 的布尔属性和一个名为 Can() 的方法。Can() 方法将 Status 属性设置为 true,并将其输出到控制台。Main() 方法是该程序的入口点,它调用 Can() 方法。
在该程序中,Can() 方法返回 Status 属性的值。因此,当您调用 Can() 方法时,它将输出 true 并返回 true。
请注意,由于 Can() 方法是实例方法而不是静态方法,因此您需要首先创建 cnew 类的实例,然后才能调用 Can() 方法。例如:
```
cnew myObject = new cnew();
myObject.Can();
```
这将创建一个名为 myObject 的 cnew 类实例,并调用 Can() 方法。
相关问题
1.Explain how bytecode (either CIL or Java bytecode) differs from machine code with examples of instructions. 2.Why autoboxing and autounboxing is not needed in C#? 3.How to decide when and when not to use auto-implemented properties in C#? 4.What is the difference between structs and class in C#? 5.How to decide between using a regular parameter declaration and a ref parameter declaration in a C# method? 6.What is the difference between modifiers new and override in C#? 7.How to decide between using a two-dimensional array and an array of arrays in a programming situation in C#? 8.Discuss the common errors that can arise with switch statements in Java and how C# eliminates those errors automatically. 9.How to use foreach loop in C#? Give one example. 10.What does this program print on the screen? Explain your answer by describing what a delegate is, including the meaning of +=. class C { delegate bool Check (int number); static bool IsEven (int number) { return number % 2 == 0;} static bool IsSmallerThan3 (int number) { return number < 3;} static void Main () { Check f = IsEven; f += IsSmallerThan3; Console.WriteLine ( f(3)); Console.WriteLine ( f(2)); } }
1. Bytecode is an intermediate code that is generated by a compiler to be executed by a virtual machine. It is platform-independent and can be executed on any platform that has a virtual machine installed. Machine code, on the other hand, is the binary code that is directly executed by a computer's CPU. Here are some examples of instructions in bytecode and machine code:
- Bytecode (CIL): ldloc.0 (load local variable 0), ldc.i4.5 (load constant value 5), add (addition)
- Machine code: mov eax, [ebp-4] (move value from memory to register), mov ebx, 5 (move constant value to register), add eax, ebx (addition)
2. Autoboxing and autounboxing is not needed in C# because C# has a feature called "value types" that allows the value types to be treated like objects. This means that value types can be used in collections and passed as parameters to methods without the need for autoboxing and autounboxing.
3. Auto-implemented properties should be used when there is no additional logic required for the getter or setter methods. If additional logic is required, then a regular property with custom getter or setter methods should be used.
4. Structs and classes are similar in that they both can contain fields, methods, and properties. The main difference is that structs are value types, while classes are reference types. This means that structs are passed by value, while classes are passed by reference.
5. A regular parameter declaration should be used when the method only needs to read the value of the parameter. A ref parameter declaration should be used when the method needs to modify the value of the parameter.
6. The "new" modifier is used to hide a method or property in a derived class, while the "override" modifier is used to replace a method or property in a base class with a new implementation in a derived class.
7. A two-dimensional array should be used when the data is logically a matrix or a table with rows and columns. An array of arrays should be used when the data is logically a collection of arrays.
8. In Java, the switch statement can cause errors if there are duplicate case values or if the break statement is not used after each case. In C#, the switch statement automatically eliminates these errors by requiring a default case and not allowing fall-through cases.
9. The foreach loop is used to iterate over a collection of items, such as an array or a list. Here is an example:
```
int[] numbers = { 1, 2, 3, 4, 5 };
foreach (int number in numbers)
{
Console.WriteLine(number);
}
```
10. The program will print "True" and "False" because the delegate "f" contains two methods, "IsEven" and "IsSmallerThan3", which are both called when "f" is invoked with a parameter. The "+=" operator is used to add the "IsSmallerThan3" method to the delegate "f". A delegate is a type that encapsulates a method or a group of methods, and the "+=" operator is used to add a method to a delegate's invocation list.
Use c # to complete the following code,Creating a Car class A class is a self-contained piece of software that is able to function on it own. We will model a car in software. Car Class Properties Year : int «private set» Manufacturer : string «private set» Model : string «private set» IsDrivable : bool «private set» Price : double «private set» Methods«constructor» Car(year : int, manufacturer : string, model : string, price : double, isDrivable: bool = true) PrintInfo() : void Description of field members: 1. year: this private member represents the year value of this object 2. manufacturer: this private member represents the manufacturer of this car 3. model: this private member represents the model of this car 4. isDrivable: this private member indicates if this car be driven 5. price: this private member represents the selling price of this car Constructor: 1. public Car(int year, string manufacturer, string model, double price, bool isDrivable = true): this is the constructor of this class. It takes five arguments and assigns them to the appropriate fields. You will assume that all the arguments will be sane (i.e. the values will not break your program). Apology: UML and some newer languages specify the type after the identifier. C# on the other hand requires that you specify the type and then the identifier. To restrict access fields are normally decorated with the private modifier. Programming II Car: fields, constructor, ToString() n.k.p Page 2 of 2 Description of action member: 1. public void PrintInfo(): this method does not take any argument but it will print all information about this object. You get to decide how the output will look like. It is expected that all the values be displayed. In your main method write the code to do the following: 1. Create at least four cars and print them. Remember to call the constructor with 4 or 5 parameters.
Here's the code to create a Car class in C#:
```
using System;
class Car
{
private int year;
private string manufacturer;
private string model;
private bool isDrivable;
private double price;
public Car(int year, string manufacturer, string model, double price, bool isDrivable = true)
{
this.year = year;
this.manufacturer = manufacturer;
this.model = model;
this.price = price;
this.isDrivable = isDrivable;
}
public void PrintInfo()
{
Console.WriteLine("Year: " + year);
Console.WriteLine("Manufacturer: " + manufacturer);
Console.WriteLine("Model: " + model);
Console.WriteLine("Is Drivable: " + isDrivable);
Console.WriteLine("Price: " + price);
}
}
```
In your main method, you can create four Car objects and print their information like this:
```
static void Main(string[] args)
{
Car car1 = new Car(2021, "Toyota", "Camry", 25000.0);
Car car2 = new Car(2019, "Honda", "Civic", 20000.0, false);
Car car3 = new Car(2018, "Ford", "Mustang", 35000.0);
Car car4 = new Car(2020, "Tesla", "Model S", 80000.0);
car1.PrintInfo();
car2.PrintInfo();
car3.PrintInfo();
car4.PrintInfo();
}
```
This will output the information for all four cars.
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)