文件名称:CalculatorA
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计算器，实现小计算功能
如有什么需要尽管说，我这里源码挺多的，我会随时上传给大家，与大家共同分享-Calculators, small computing power if there is any need to even though I挺多source here, I will upload to you at any time, to share with you
如有什么需要尽管说，我这里源码挺多的，我会随时上传给大家，与大家共同分享-Calculators, small computing power if there is any need to even though I挺多source here, I will upload to you at any time, to share with you
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CalculatorA.java