Since this program can only display messages or run commands, it refuses to create an alarm that has neither a message nor a command.

因为此程序只能显示消息或运行命令，所以它拒绝创建既不是消息也不是命令的警报。

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This program could naturally be extended to display an appropriate error message, which is explained next.

该程序可以被自然地扩展为显示适当的错误消息，我们在下一步将解释它。

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Now, when a user enters 40 CC for the vehicle data, the program must display a message saying that the entry does not fall within the valid CC range. You can show the message simply as in Listing 1.

现在，当用户输入的车辆数据为40cc时，程序必须显示一条消息，说明输入的数据不在有效的CC范围内。

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