Writing the value of std::endl to output stream have two function:
First: Ends the line of output.
Second: Flushes the buffer, which forces the system to write to the output stream immediately.
转载于:https://my.oschina.net/zengsai/blog/1258
Usage of std::endl
本文介绍了在C++中使用std::endl的两个主要功能：结束当前行输出并强制刷新缓冲区，确保所有输出立即呈现。
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