data encapsulation

数据封装是面向对象编程中的一个重要概念，它是将数据和操作这些数据的方法组合在一起的一种机制。这种机制保证了数据的安全性和可靠性，同时也隐藏了数据的内部实现细节，使得程序更加易于维护和扩展。在C++中，数据封装通过将数据成员声明为私有(private)来实现，然后通过公共(public)成员函数来访问和修改这些私有数据成员。这种访问控制机制可以防止程序中的任意部分直接访问对象的私有数据成员，从而提高了程序的安全性和可靠性。

相关问题

encapsulation dot1Q 981

encapsulation dot1Q 981是用于配置以太网子接口的vlan号以及封装格式为802.1q的命令。其中，参数指定了vlan号的取值范围为1～4095。该命令可以在以太网子接口配置模式下使用，用于将特定以太网子接口划分到指定的vlan，并且使用802.1q封装格式。需要注意的是，该命令只能与同时遵循802.1q标准的交换机或其它具有vlan功能的设备兼容。举例来说，如果要将以太口子接口0/0.100划分到vlan 981，并使用802.1q封装格式，可以使用以下命令：

router(config)#interface ethernet 0.100
router(config-subif)#encapsulation dot1Q 981

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local variable data1 referen

ces to a specific value within a specific function or block of code. It is not accessible or visible outside of that function or block. It is used to store temporary or data that is only needed within that specific context.

For example, consider the following code snippet:

function example() {
  let data1 = 10;
  console.log(data1); // Output: 10
}

example();
console.log(data1); // Error: data1 is not defined

In this example, `data1` is a local variable within the `example` function. It can be accessed and used within the function, but it cannot be accessed outside of it. The second `console.log` statement outside the function would result in an error since `data1` is not defined in that context.

Local variables are important for encapsulation and maintaining data integrity within functions or blocks of code. They help in organizing and isolating data within specific scopes, preventing unintended access or modifications from other parts of the code.