C++提供了大量的用于执行格式化输入/输出的流操纵算子。流操纵算子提供了许多功能，如设置域宽、设置精度、设置和清除格式化标志、设置域填充字符、刷新流、在输出流中插入换行符并刷新该流、在输出流中插入空字符、跳过输入流中的空白字符等等。-C++ provides a lot of used to perform formatted input/output flow control operator. Flow control operator offers many features, such as setting the field width, precision setting, set and clear format flags, set up the domain filled with characters, flush the stream, insert line breaks in the output stream and flushes the stream, in the output stream into the air character, skip whitespace characters in the input stream and so on.