A calculator written by VB
20180410 v0.1面向对象初识
20180417 v0.2制作计算器
20180424 v0.3通过int()转换实现多位数的运算(运算更改为字符转换式)
20180508 v0.4实现括号优先级(内含单次)运算
20180515 v0.4.1继续实现
(运算更新为类windows附件,连算前自动得出上一步结果)
20180520 v0.4.2基本实现括号内容
20180820 v0.4.3修复错误
A calculator written by VB
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