在以阶段划分的编译器中，（ ）阶段的主要作用是分析程序中的句子结构是否正确。
- A.词法分析
- B.语法分析
- C.语义分析
- D.代码生成
正确答案及解析
正确答案
解析
词法分析：从左到右逐个扫描源程序中的字符，识别其中如关键字（或称保留字）、标识符、常数、运算符以及分隔符（标点符号和括号）等。
语法分析：根据语法规则将单词符号分解成各类语法单位，并分析源程序是否存在语法上的错误。包括：语言结构出错、if…endif不匹配，缺少分号、括号不匹配、表达式缺少操作数等。本题属于语法分析阶段的作用。
语义分析：进行类型分析和检查，主要检测源程序是否存在静态语义错误。包括：运算符和运算类型不符合，如取余时用浮点数。
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