然后就像使用手机一样回到应用程序,并像 图 10 中一样使用键盘输入一条消息。
Then you return to the application just as you would on the phone and type a message using the keyboard as in Figure 10.
您可以使用键盘输入这些表达式,然后观察expr的工作,现在您已经有了足够的知识来修改该计算器代码,以添加支持这些函数的按钮。
You can use the keyboard to type these in and see expr work; and you should have enough knowledge now to modify the calculator code to add buttons that support these functions.
可以使用虚拟键盘输入文本。
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