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https://sourceforge.net/projects/gnuwin32/forums/forum/74807/topic/3520921
By: ubuntu-nathan
Hello,
I've downloaded just Bison of the GnuWin32 compiler pack, I've downloaded the
setup without sources and all got right when installing, then I tried to test
it with the simple rpcalc.y example:
[code]/* Reverse polish notation calculator. */
%{
#define YYSTYPE double
#include <math.h>
%}
%token NUM
%% /* Grammar rules and actions follow */
input: /* empty */
| input line
;
line: '\n'
| exp '\n' { printf ("\t%.10g\n", $1); }
;
exp: NUM { $$ = $1; }
| exp exp '+' { $$ = $1 + $2; }
| exp exp '-' { $$ = $1 - $2; }
| exp exp '*' { $$ = $1 * $2; }
| exp exp '/' { $$ = $1 / $2; }
/* Exponentiation */
| exp exp '^' { $$ = pow ($1, $2); }
/* Unary minus */
| exp 'n' { $$ = -$1; }
;
%%
/* Lexical analyzer returns a double floating point
number on the stack and the token NUM, or the ASCII
character read if not a number. Skips all blanks
and tabs, returns 0 for EOF. */
#include <ctype.h>
yylex ()
{
int c;
/* skip white space */
while ((c = getchar ()) == ' ' || c == '\t')
;
/* process numbers */
if (c == '.' || isdigit (c))
{
ungetc (c, stdin);
scanf ("%lf", &yylval);
return NUM;
}
/* return end-of-file */
if (c == EOF)
return 0;
/* return single chars */
return c;
}[/code]
But when I've tried to use bison: [i]C:\> bison rpcalc.y[/i], I just got a lot
of garbage: [url]http://nathanpc.pastebin.com/f2fae6710[/url], it's too much
big, then I've posted at pastebin.
[list]
[*]Why is this happening?
[*]What I need to do?
[*]Have this already happened to you?
[/list]
Best Regards,
Nathan Paulino Campos
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