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, increase operational priority, operations in brackets first.