一个科学计算器的源程序，包含大部分的科学计算功能。(-a scientific calculator source, contains most of the scientific computing functions. (

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:

c++编写的科学计算器源代码，支持科学计算及表达式计算，可选择角度、弧度制，自带常量-scientific calculator source code written by c++ support scientific computing and expressions to select the angle in radians, comes with constant