I am new to yacc and I am trying to define some rules for my language. I have written a grammar "well" and it runs and executes without an error but f ...

I'm trying to run a simple progam in flex that reads the string "hello world" and prints "Goodbye" here is the file: the commands are Error mes ...

I have a question about this code I would like to create a IF / ELSE in YACC and LEX. but I have difficulties to detect the condition and excute de ri ...

The code isn't wrote in English(variable names, but that shouldn't be a problem). The yytext function doesn't copy what I want to copy. Here is the re ...

I built C parser from Lex/Flex & YACC/Bison grammars (1, 2) as: and then tested on this C code: which is expected to produce missing termina ...

I have %union{ nodeType *node; } in parser.y, but 1.When i call $num->op or $num->string or $num->nodeType, error occurred. ex. 2.When i ...

I am learning lex. I made a simple lex file containing one rule: After running lex file.l, I’d like to inspect the outputted file file.yy.c. I pres ...

I'm working on a Lex+Yacc calculator that is capable of performing basic arithmetic operations, as well as supporting usage of parentheses. From my te ...

I'm new to Lex-Yacc, I have a Python Lex-Yacc Parser for parsing string query. Its working fine with precedence rules as: but i want to add additio ...

My Code: %{ #include<stdio.h> %} %% "int"|"char"|"double"|"void"|"main" {printf("\n%s is a keyword",yytext);} ^[a - z A - Z _][a - z A - ...

I write this lex program but there is an error if you can check my code because i check it a lot, but i didn't find it. This is the code: %{ #in ...

I am writing an (f)lex/bison/C parser for a language in which strings are enclosed in single quotation marks. A quotation mark within a string is dupl ...

Consider a flex file file1.l Consider another flex file file2.l Note that file1.l and file2.l differ only in int main() part. We use following c ...

I was wondering if there is some way to extend a regex definition without repeating the symbols inside. For example, the following definitions are al ...

I try to make an analizer/parser of the code of prolog, here is an example of a fact: "dadof(arturo,armando)." It ends with a dot (.) and my parser re ...

Let's say I have a SQL-like language that supports seeing if two expressions are equal only if they are the same type, and if they're not the same typ ...

A book that I am reading [1] says something that I need help understanding. The book first describes the input(), output(), and unput() functions. Th ...

My input file consists of one byte, the NUL character (hex 0). I have a Flex rule that matches the NUL character and the action returns it: Below ...

I have been slowly getting used to the whims of the flex lexer and, while it's pretty cool once (1) I have manage to get it to actually work and (2) I ...

I am using the -d flag when I run Flex, so that the scanner will generate debug messages. It works fine but the output contains some odd (unexpected) ...