说明： 该文描述了C语言表达式的文法，并由该文法生成算符优先矩阵和算符优先函数，讨论了C语言表达式的特点和文法分析过程。 (The paper describes the expression of the C language grammar, grammar generated by the operator priority matrix and operator priority function to discuss the C language features of the expression and grammar analysis.)
