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命令模式实现简单计算器功能包括撤销

上传者: chongdajerry | 上传时间:2023/11/10 15:27:48 | 文件大小:7KB | 文件类型:rar
命令模式实现简单计算器功能包括撤销
考虑一个计算器功能,只能实现加法和减法运算。
但是,这个计算器支持撤销操作。

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