# 基于流的I/O操作

流I/O是由Ｃ语言的标准函数库提供的，因此也称为标准I/O。标准I/O库及其头文件“stdio.h” 提供了一个全面的面向底层的I/O系统调用的操作界面，使我们能够设置输出数据的格式和扫描处理输入数据，他还负责协调设备的数据缓冲。我们最书序的`printf()`和`scanf()`都是属于基于流的I/O函数。


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