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Jan 14, 2012 · You first have to go to the directory which the file wordcount.l is in using cd. Then using lex wordcount.l will make the file lex.yy.c. To the run the program you need compile it with a c compiler such as gcc. With gcc you can compile it using gcc -lfl lex.yy.c. This will create a.out which can be run using ./a.out. answered Jan 14, 2012 at 3:26.
Mar 28, 2011 · Open a prompt, cd to the directory where your ".l" and ".y" are, and compile them with: flex hello.l. bison -dy hello.y. gcc lex.yy.c y.tab.c -o hello.exe. You will be able to run the program. I made the sources for a simple test (the infamous Hello World):
Feb 7, 2015 · Sorted by: 1. A lex file is a file that contains regular expressions and embedded C code. The lex tool takes a lex file and translates it into a pure C file that only contains the C code from the lex file along with code generated from the regular expressions. The C compiler is a tool that takes a C file and translates it into machine code.
Lex and Yacc are maintained by the Unix SVRx licencees - companies such as IBM (AIX), HP (HP-UX) and Sun (Solaris) have modified versions of Lex and Yacc at their command. MKS also provides MKS Lex and MKS Yacc; however, the Yacc at least has some non-standard extensions. Flex and Bison are free. (AT&T) Lex and Yacc are not.
Nov 25, 2015 · 11. lex is a lexical analyzer. It splits text up into tokens. Its power is roughly equivalent to regular expression matching. yacc is a parser generator. It takes a sequence of tokens (say, from lex) and interprets them as series of statements. Its power is roughly equivalent to context free grammars.
2. You have the direct answer to your question from trojanfoe - you need to include <stdio.h> to declare the function printf(). This is true in any source code presented to the C compiler. However, you should also note that the conventional suffix for Yacc source is .y (rather than .yacc), and for Lex source is .l (rather than .lex).
Aug 20, 2013 · 2. I'm extremely new to Lex and the complete requirement of this problem is as follows: Write a Lex input file that will produce a program that counts characters, words, and lines in a text file and reports the counts. Define a word to be any sequence of letters and/or digits, without punctuation or spaces.
117. Use the synaptic packet manager in order to install yacc / lex. If you are feeling more comfortable doing this on the console just do: sudo apt-get install bison flex. There are some very nice articles on the net on how to get started with those tools. I found the article from CodeProject to be quite good and helpful (see here).
Aug 29, 2010 · There are potentially some advantages to using Yacc/Lex, but it is not mandatory to use them. There are some downsides to using Yacc/Lex too, but the advantages usually outweigh the disadvantages. In particular, it is often easier to maintain a Yacc-driven grammar than a hand-coded one, and you benefit from the automation that Yacc provides.
Jan 16, 2012 · When I compiled a copy of your code on MacOS X (10.7.2) with flex (2.5.35) and gcc (4.6.1), the only complaints I got from the C compiler were about the non-prototype definition of main(), and that was because I always compile with that warning enabled and mention of yyunput() defined but not used (which is not your fault).
