本程序所做的计算器有简单的操作界面，实现一般的数字运算及常用的科学计算，运算的精度可满足一般的计算要求，且经过测试运算结果的可靠性强。-This procedure made a simple calculator interface, the realization of digital computing in general and commonly used in scientific computing, computing the accuracy of the calculatio