Re: another problem about the calc++ example

[Wang Yige]

Hi,

Thanks for your reply first:)

I read the Flex manual and it defines yyin only stdio and FILE * type .

I am a beginner of BISON and there is another problem. I copy the files of 
Calc++ examples on Bison manual:
calc++.cc ,calc++-driver.cc ,calc++-driver.hh ,calc++-parser.yy, 
calc++-scanner.ll 

Then I try to make them as follows steps:
flex -o calc++-scanner.cc calc++-scanner.ll
bison -o calc++-parser.cc calc++-parser.yy
g++ -o calc++ calc++.cc calc++-driver.cc calc++-parser.cc alc++-scanner.cc

But when I try "flex -o calc++-scanner.cc calc++-scanner.ll" on my 
HP-Unix(Bison-2.3) and it occurs:
flex: can't open calc++-scanner.cc
make: *** [calc++] Error 1

Is the file "calc++-scanner.cc" the target file which should be generated 
by calc++-scanner.ll ? If it is , the "flex -o calc++-scanner.cc 
calc++-scanner.ll" didn't generate it. Then I copy this file from the 
../bison-2.3/examples/calc++/ to my own directory in which 
calc++-scanner.ll saved . I execute "flex -o calc++-scanner.cc 
calc++-scanner.ll" and more errors like this occur:
calc++-scanner.cc", line 567: unknown error processing section 1
calc++-scanner.cc", line 567: bad character: *
......

I also try to make the calc++ in ../bison-2.3/examples/calc++/ with its 
Makefile ,but the Makefile in ../bison-2.3/examples/calc++/ is so 
complicated that I nearly don't know how to make it whit the Makefile:( 

In attachments, there are files mentioned above and the makefile of 
myself,would you like to check them for me ? Thank you very much !

Best Regards,
Wang Yige

> From: Hans Aberg <address@hidden>
> To: Wang Yige <address@hidden>
> CC: address@hidden
> Subject: Re: Is the const variable supported by yyin?
> Date: Fri, 30 Jun 2006 19:32:59 +0200
>
> On 29 Jun 2006, at 10:19, Wang Yige wrote:
>
> > I checked the bison manual and found there only examples of yyin is 
> >  ostream type and FILE * type, does the yyin support the variable  
> > type ? I recomplied the example of rpcalc in bison manual ,if I  
> > define a const variable with char * type in main(void) and want to  
> > make the yyparse() parse it correctly, what & how should I do ?
>
> The Bison generated parsers parses a stream of tokens. It is the  
> lexers that feed the parsers that make use of character streams. If  
> you use Flex to generate your lexer, you might try: Flex Help <help- 
> address@hidden>.
>
>   Hans Aberg

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