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- 逻辑表达式从键盘输入,长度不超过一行;逻辑运算符包括“|”、“&”、“~”,分别表示或、与、非,运算优先程度递增,括号内的运算优先。-Logical expression from the keyboard input, the length of no more than a line logical operators including " |" ," & " ," ~" , respectively, or with, non, i