1.完成2^63以内的 +,-,*,/,^,的运算
2.完成sin,cos,取倒数的运算
3.完成前中后缀表达式之间的转化
1.支持小数运算,最多会保留5位小数
2.前缀表达式和后缀表达式暂不支持运算操作,请先通过转换器将表达式转换为中缀表达式,再进行中缀表达式的运算
3.若输入的表达式不合法,会输出"Wrong Expression"
windows11 , Qt6.3
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