本实例演示了一个可以进行简夢的整数四则运算的计算器程序。在本例子中要求用户输入 一个由整数组成的四则运算多项式，程序计算出最终结果，并显示给用户。本实例主要向读者 介绍运算符的优先级以及递设计程序的方法。-This example demonstrates a simple dream integer arithmetic calculator program. In this example the four operations require users to enter an integer polynomial, the program calculates the final result, and displayed to the user. This example introduces the reader to the priority of the operator as well as the delivery method of the design process.