这是一个对数学表达式求值的C++ class，详细的说明在Calculator.pdf中。 这个Calculator class虽然经过我多次测试，改正了不少错误，但我不保证在将来的使用中它不会对您的程序造成影响，对您在使用中造成的一切后果，本人不承担任何责任。-this a mathematical expression evaluates the C class, detailed descr iption of the Calculator.pdf China. The Calculator class despite my repeated testing, correct many mistakes, but I do not guarantee in the future it will not use the procedure to you impact your right to use all the consequences of that, I do not accept any responsibility.