实现一个简易计算器，计算简单表达式字符串的值。
Implement a basic calculator to evaluate a simple expression string.
简易计算器，能进行加，减，乘，除等运算，还有一些异常捉获。
Simple calculator, able to add, subtract, multiply, divide, such as computing, there are some anomalies captured.
首先，让我们看一下您每个月结算账单时所使用的那种简易计算器。
Take a moment to think about the way you use a simple handheld calculator to balance your checkbook each month.
你有的是，一个简易的计算器和五根手指。
What you have is with a simple calculation five significant figures.
设计简易交互式计算器，功能如下：(1)计算器功能与Windows操作系统带的标准型的计算器系统相同。
Design simple interactive calculator, function as follows: (1) calculator function and Windows operating system with the standard system of the same type of calculator.
设计简易交互式计算器，功能如下：(1)计算器功能与Windows操作系统带的标准型的计算器系统相同。
Design simple interactive calculator, function as follows: (1) calculator function and Windows operating system with the standard system of the same type of calculator.
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