输入待计算的逻辑表达式及变元的真值，计算该表达式的真值。 支持的逻辑运算包括 否定 ！ 合取 + 析取 － 蕴含 # 等价 $ -Enter the logical expression to be calculated and the true values of variables, calculate the truth value of expressions. Supported by logic operations, including the