自认为比较完善的计算器，拥有很强大的科学计算功能，在百度上输入科学计算器，这就是以那个界面为蓝本做的，功能都是自己一步一步敲代码实现的。大家可以借鉴一下。-Since more complete calculator that has a very strong scientific computing, scientific calculator, enter in Baidu, which is modeled on that interface to do, features are st

设计一个能实现计算器功能的Java程序，可以进行加、减、乘、除（另外可适当加上阶乘、正弦、余弦和指数）运算。 -Design a Java program to achieve functional calculator that can add, subtract, multiply and divide (the other may be appropriate to add factorial, sine, cosine and exponential) operations.

通过Java实现计算器小程序的功能，简化输入与输出(Implement the calculator function)