该文档为简单计算器(51单片机程序)介绍，是一份不错的参考文档，可以看一看。-The document for the simple calculator (51 SCM procedures), is a good reference document, you can take a look.

该文档为简单计算器(51单片机程序)介绍，是一份不错的参考文档，可以看一看。-The document for the simple calculator (51 SCM procedures), is a good reference document, you can take a look.

该文档为简单的51单片机计算器程序介绍，是一份不错的参考文档，可以看一下。-The document for the simple 51 single-chip calculator program introduced, is a good reference document, you can look at.