Category : Miscellaneous Language Source Code
Archive   : SYACC31B.ZIP
Filename : YACC.259

 
Output of file : YACC.259 contained in archive : SYACC31B.ZIP

#include
#include
#include
#include

#define PA_STACK_TYPE int

#define LEXER lexer
char* lexer ();

#define MALLOC(x) ((x *) malloc (sizeof(x)))

%%
// this is the precedences and associativity declarations area
%%
//
// A simple calculator
//
line : expr '\n'
{ printf ( "\nTHE RESULT: %d\n", *$1 ); }
;
expr : expr '+' term
{ *$$ = *$1 + *$3; }
| term
;
term : term '*' factor
{ *$$ = *$1 * *$3; }
| factor
;
factor : '(' expr ')'
{ *$$ = *$2; }
| DIGIT
;
%%


char token[128];

char* lexer()
{
int c;
int value;

c = getche ();

/* using Renter key to signify the end of input */
if ( c == '\r' )
return "";
else if ( isdigit (c) )
{
token_value = MALLOC (int);
*token_value = c - '0';
return "DIGIT";
};
token[0] = c;
token[1] = '\0';

return token;
};



  3 Responses to “Category : Miscellaneous Language Source Code
Archive   : SYACC31B.ZIP
Filename : YACC.259
”

  1. Daniel says:
    January 27, 2013 at 3:59 pm

    Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. Joshie says:
    March 18, 2014 at 4:57 pm

    This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. DiskingRound says:
    January 14, 2015 at 10:57 pm

    But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/