ins624y@monu4.cc.monash.edu.au (mr r. walker) (09/30/90)
Hi! At the moment I am attempting to write a parses for integer infix maths formulas, using that dynamic duo Lex and Yacc. I am not having much luck --- if anyone out there could email me the yacc and/or lex code to do this I would be *VERY* grateful (unfortunately, I do not have a pretty sister .... well, there go all the females who were going to help me out ....) I doesn't have to be a flash all-singing all-dancing parses --- all I want it to do is calculate expressions like 1+2*3+(45+3)/4 --- no variables, only integer expressions (ie. a/b only gives the integer part of the answer). HHHeeelllpppp!!!! Thanks, Rod.
smd@vab02.larc.nasa.gov (Steve M. Dahmen) (10/01/90)
In article <4746@monu1.cc.monash.oz> ins624y@monu4.cc.monash.edu.au (mr r. walker) writes: > > > At the moment I am attempting to write a parses for integer >infix maths formulas, using that dynamic duo Lex and Yacc. > >I am not having much luck --- if anyone out there could email me >the yacc and/or lex code to do this I would be *VERY* grateful Amen! Might there be one to work with floating point and strings as well floating around anywhere? Beginning YACCer, Steve Dahmen -- Steve Dahmen, Systems Analyst (804) 864-4519 (W) Space Systems Division, Vehicle Analysis Branch M/S 365, NASA Langley Research Center Hampton, Virginia 23665 smd@vab02.larc.nasa.gov
henry@zoo.toronto.edu (Henry Spencer) (10/02/90)
In article <4746@monu1.cc.monash.oz> ins624y@monu4.cc.monash.edu.au (mr r. walker) writes: > At the moment I am attempting to write a parses for integer >infix maths formulas, using that dynamic duo Lex and Yacc. Pardon the cynicism, but this wouldn't happen to be a homework assignment, would it? Recommended reading is "The UNIX Programming Environment", by Brian W. Kernighan and Rob Pike, Prentice-Hall 1984. Chapter 8 discusses doing almost exactly what you're after. Being cynical again, beware that your instructor has undoubtedly seen K&P and will recognize a straight copy from it. :-) -- Imagine life with OS/360 the standard | Henry Spencer at U of Toronto Zoology operating system. Now think about X. | henry@zoo.toronto.edu utzoo!henry
mhill@fiveliter.EBay.Sun.COM (Maurice Hill) (10/03/90)
henry@zoo.toronto.edu (Henry Spencer) writes: >Being cynical again, beware that your instructor has undoubtedly seen >K&P and will recognize a straight copy from it. :-) and he/she may also read this group!!!
mef@romulus.rutgers.edu (Marc E. Fiuczynski) (04/05/91)
This is a desperate move. I need a good example of a yacc grammar.
If you have that you would like to share with me please send it to
me via e-mail. I'm trying to use yacc learning/reading the sun manual
and I'm not getting anywhere. Please, if you can send me a yacc grammar
that you wrote I would really appreciate it.
The reason for this urgency is that I am working on an (independent)
project for school and I am getting stuck on using yacc.
Thanks in advance!
-Marc
--
______________________________________________________________________________
Marc E. Fiuczynski \\ Home: (609) 683-4416 School: (908) 878-9388
mef@remus.rutgers.edu // UUCP: {backbone}!rutgers!remus.rutgers.edu!mefgwyn@smoke.brl.mil (Doug Gwyn) (04/06/91)
In article <Apr.5.00.38.07.1991.2057@romulus.rutgers.edu> mef@romulus.rutgers.edu (Marc E. Fiuczynski) writes: >This is a desperate move. I need a good example of a yacc grammar. This wasn't really a C question, but since you bring it up, I'd like to remark that the best tutorial on the use of yacc that I know of is the development of the "hoc" utility in Kernighan and Pike's "The UNIX Programming Environment", available in better bookstores everywhere.
jseymour@medar.com (James Seymour) (04/06/91)
In article <Apr.5.00.38.07.1991.2057@romulus.rutgers.edu> mef@romulus.rutgers.edu (Marc E. Fiuczynski) writes: >This is a desperate move. I need a good example of a yacc grammar. What you really need, IMHO, is a copy of "The UNIX Programming Environment" by Kernighan and Pike. There is a complete chapter on yacc (with lex also covered briefly). In that chapter is a complete example of a yacc program that they call "hoc" (high order calculator). In the example, hoc is implemented in steps, starting with the simplest concepts and working up to the more complex. Each iteration of the program (there are, I think, five or six) adds new concepts. I recommend it highly. Be warned, there are a couple of design/coding snafus. Boy, did I learn a lot about how that program works from tracking those down :-). On the other hand, these did not bite me until I went on to "extending" the thing. >Thanks in advance! >-Marc >-- >______________________________________________________________________________ >Marc E. Fiuczynski \\ Home: (609) 683-4416 School: (908) 878-9388 >mef@remus.rutgers.edu // UUCP: {backbone}!rutgers!remus.rutgers.edu!mef -- Jim Seymour | Medar, Inc. ...!uunet!medar!jseymour | 38700 Grand River Ave. jseymour@medar.com | Farmington Hills, MI. 48331 CIS: 72730,1166 GEnie: jseymour | FAX: (313)477-8897
gwyn@smoke.brl.mil (Doug Gwyn) (04/08/91)
In article <109@hdwr1.medar.com> jseymour@medar.com (James Seymour) writes: >Be warned, there are a couple of design/coding snafus [in "hoc"]. I think our local version has most or perhaps all of these stamped out, plus I typed up the manual for "hoc" (in -ms format). If you're actually using "hoc" and are concerned about porting it, feel free to contact me for a copy of our "hoc" sources.
stanley@phoenix.com (John Stanley) (04/08/91)
mef@romulus.rutgers.edu (Marc E. Fiuczynski) writes: > This is a desperate move. I need a good example of a yacc grammar. > If you have that you would like to share with me please send it to > me via e-mail. I'm trying to use yacc learning/reading the sun manual > and I'm not getting anywhere. Please, if you can send me a yacc grammar > that you wrote I would really appreciate it. Check your bookstore. I found one of the Nutshell books that covers yacc and lex. (This was in the Stanford Bookstore -- the kind of place that makes you think you have died and gone to computer heaven.)