VB直接实现的算式计算器，无需外部的Dll,使用时，直接输入一个算式，包括括号，程序会自动计算出正确答案。不会像一般的计算器那样只能一步一步的计算。-Direct realization of the formula VB calculators, without external Dll, when used directly into a formula, including the brackets, the program will automatically calculate the correct answer. Not as general as the Calculator only step-by-step calculations.