Description: Input a expressions, including 0 ~ 9 and minus the decimal point of floating-point and add, subtract, multiply and divide operator, should also contains parentheses. Other characters are illegal input error, and expression to# end. Output operation result. Program can achieve results are: applicable to the calculation of floating point type, and is applicable to the operations of connection, and is suitable for the operation of a negative number. The input expression is the function of the judge
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biaodashiqiuzhi
...............\表达式计算.cpp
...............\表达式计算.obj
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