本计算器可以进行简单的四则运算（加、减、乘、除）但仅限于十进制下，还可以进行（八进制，十进制，十六进制）之间的相互转换-This calculator can be a simple four operations (addition, subtraction, multiplication, in addition to the mutual conversion between) but only under the decimal (octal, decimal, hexadecimal)

利用二叉树实现十进制四则运算，并输出结果-Binary tree decimal arithmetic, and outputs the result.

通过栈实现多项式相加的四则运算，过程比较简单，适合初学者学习-By stack polynomial arithmetic sum of the four, the process is relatively simple, suitable for beginners to learn

实现功能参照Windows操作系统计算器功能，实现四则运算和简单函数计算-come ture game