What is the purpose of using in C++?
In C++, the ‘using’ keyword serves two main purposes.
- By using the using namespace statement, you can import all the members of a namespace. For example, using namespace std; allows us to use the standard library without needing to include the std:: prefix, simplifying the code and improving readability.
- using别名：另外，使用关键字也可用于为类型创建别名。使用关键字，我们可以为一个类型创建一个新的名称，有助于增加代码的可读性。比如，使用 myInt = int; 可以定义一个名为 myInt 的新类型，它实际上是 int 类型的别名，可用于变量声明。
It is important to note that while using “using” can simplify code and enhance readability, excessive use of “using” may lead to naming conflicts and ambiguities, so caution should be exercised when using it.
