在C++语言中，用户经常会使用到输入输出操作，即“cin”和“cout”。其中，操作符“cin”在默认情况下，表示计算机的键盘。而操作符“cout”在默认情况下表示计算机的显示屏幕。实际上在C++语言中，还有其他的一些用于输入输出操作的类或者是函数方法。因此，在本章中，将向用户介绍这些输入输出流类及其相关的功能函数方法-In C++ language, users often will be used to input and output operations "cin" and "cout". Among them, the operator "cin" by default, represents the computer s keyboard. The operator "to cout by default that the computer display screen. In fact, in C++ language, as well as some other classes for input and output operation or function method. Therefore, in this chapter, will be introduced to the user input and output stream class and its related features function method