在本小节完成之后，您的应用程序的外观将类似于图8，并且包含显示剩余字符数的功能。
By the end of this section, you should have an application that looks like Figure 8, complete with remaining character count functionality.
该函数的功能正如您所想：它测试一个数是否是偶数。
This function does just what you would think: It tests if a number is even.
它表面看来的复杂性引发了数十年的研究，但其部分功能依然是个未知数。
Its seeming complexity has prompted decades of study, although some of its functions remained unknown.
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