该计算器有两个主要部分，标准计算器和科学计算器，科学计算器功能尚未完成。

用的知识：按钮，菜单，布局，面板，窗口，事件，对话框，标签，单选钮。

有兴趣的读者可以完成剩下的功能。

-The calculator has two main parts, the standard calculator and a scientific calculator, scientific calculator function has not been completed. Knowledge: button, menu, layout, panel, window, event, dialog boxes, labels, radio button. The interested reader can complete the rest of the functions.