11组表达式求值
代码说明:
设计一个表达式求值的程序。该程序必须可以接受包含(,),+,-,*,/的中缀表达式,并求出结果。如果表达式正确,则输出表达式的结果;如果表达式非法,则不输出或输出其他字符。(Design an expression evaluation procedures. The program must accept (,), including +, -, *, / the infix expression, and the results obtained. If the expression is correct, the output of the expression is output; if the expression is illegal, no other characters are output or exported.)
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