用delphi实现的计算器，实现了基本的功能，提供给新手练习，还有一些BUG有待修正，本工程可以让新手减少一些时间。-With the realization of Delphi calculators, and realize the basic function, provide the new practice, and some BUG needs to be fixed, the project can let novice reduce some of the time.