递归下降分析器分析普通的四则运算

上传者: bblnhbu | 上传时间: 2022-05-15 15:04:32 | 文件大小: 45KB | 文件类型: RAR
1、使用递归下降分析算法分析表达式文法: exp ::= exp addop term | term addop ::= + | - term ::= term mulop factor | factor mulop ::= * | / factor ::= (exp) | number 其中number可以是多位的十进制数字串(整数即可),因此这里还需要一个小的词法分析器来得到number的值。 2、该词法分析器以子程序形式出现,当需要进行词法分析时进行调用; 3、能够识别正确和错误的表达式; 4、在进行语法分析的过程中,计算输入表达式的值

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评论信息

  • qq_39083806 :
    不错,值得借鉴
    2018-04-11
  • zouweiyangjiayou :
    很好地诠释了递归下降分析四则运算
    2011-11-03

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