calculate

代码说明：

  这学期开了软件工程工具及其应用这么课，任老师给我们教了matlab程序设计语言，做了课程实验，自己用matlab实现了计算器，发现MATLAB确实是一门很有用得计算机编程语言，它把数值计算和可视化环境集成到一起，非常直观，而且提供了大量的函数，功能强大，工应用范围广泛。 (Opened this semester and its application software engineering tools such class, any teacher taught us matlab programming language, has done a course experiments using matlab realize their own calculators, found that MATLAB is indeed a very useful computer programming language , which the numerical computation and visualization environment for integrated together, very intuitive, but also provides a large number of functions and powerful, the broad scope of application.)