在单片机的开发应用中，已逐渐开始引入高级语言，C语言就是其中的一种。对用惯了汇编的人来说，总觉得高级语言’可控性’不好，不如汇编那样随心所欲。但是只要我们掌握了一定的C语言知识，有些东西还是容易做出来的，以下是笔者实际工作中遇到的几个问题，希望对初学C51者有所帮助。-The development and application of the SCM has gradually started to introduce high-level language, C language is one of them. Always feel for people who are used to assembly the　controllability　of the high-level language, it is better to compile as arbitrary. But as long as we mastered a certain knowledge of C language, some things still to do it easily, the following are several problems encountered in the practical work of the author, I hope to help beginner C51.