stringstream

`stringstream` 是 C++ 中的一个标准库，用于将字符串转换为其他类型的数据（例如数字或bool值），或者将其他类型的数据转换为字符串。它是 `iostream` 库的子类，因此它具有与 `cin` 和 `cout` 相似的操作。 `stringstream` 对象可以通过输入字符串来构造，也可以通过输出流来构造，因此可以方便地将任何类型的数据转换为字符串，并将其输出到流中。在使用 `stringstream` 时，需要包含头文件 `<sstream>`。

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Stringstream

Stringstream is a class in C++ that allows you to read and write strings as if they were input/output streams. It is used for converting strings to numerical values, parsing strings, and formatting output. The class is defined in the header file <sstream>. The stringstream class allows you to treat a string as if it were a stream, which means you can use all the standard stream input/output operations on it. This includes inserting data into the string, extracting data from the string, and formatting the string using manipulators. The stringstream class is especially useful when you need to parse a string into individual tokens, or when you need to convert a string into a numerical value.