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[ELanguage] CP_work_8 DL : 0: 设计一个四则表达式分析软件，其接受从文件或键盘输入的四则表达式（运算对象支持整数和变量），给出该表达式的二叉树表达形式，并在键盘上按后续遍历方式输出该二叉树。例如，输入a+b*c，输出 a b c * + 提示：参考下列的设计指导: 递归下降分析法实验设计思想及算法为G的每个非终结符号U构造一个递归过程，不妨命名为U。U的产生式的右边指出这个过程的代码结构： (1)若是终结符号，则和向前看符号对照，若匹配则向前进一个符号；否则出错。 (2)若是非终结符号，则调用与此非终结符对应的过程。当A的右部有多个产生式时,可用选择结构实现。-Design a four-expression analysis software, which accepts four expressions from a file or keyboard input (support integer operands and variables), given expression in the form of a binary tree of the expression, and on the keyboard, press the subsequent traversal of the binary output. For example, enter a+ b* c, output a b c*+ Note: Refer to the following design guidelines: Recursive descent experimental design ideas and algorithm analysis To construct each nonterminal U G a recursive process, it may be named as U. U generates right-hand side indicates the code structure of the process: (1) If the end of the symbol, and lookaheads contrast, if the match is to advance a symbol otherwise error. (2) If the non-terminal symbol, then call this nonterminal corresponding process. When there are multiple right part A of production, s
Date : 2026-01-10 Size : 149kb User : jchen