Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucrmath!rearl
From: rearl@watnxt3.ucr.edu (Robert Earl)
Newsgroups: comp.unix.questions
Subject: Re: how do I declare a constant as a variable of different type
Message-ID: <REARL.91May22223127@watnxt2.ucr.edu>
Date: 23 May 91 05:31:27 GMT
References: <16452@helios.TAMU.EDU>
Sender: news@ucrmath.ucr.edu
Followup-To: comp.lang.c
Organization: (EVIL!)
Lines: 33
In-reply-to: n077gh@tamuts.tamu.edu's message of 23 May 91 03:16:32 GMT

In article <16452@helios.TAMU.EDU> n077gh@tamuts.tamu.edu (Sharma Anupindi) writes:

|	   I read a string ( which is unknown prior to readig ) into character variable.
|   like:
|	   char name[30];
|	   fsacnf(fp,"%s",name);
|   Now I want to declare the string I have read from the file as a different variable.


For the most part, You Can't Do That in C.  The best you can do is
create an array of structs, such as:

#define NUMVARS 50

	struct {
	  char *nam; /* or char nam[80]; */
	  int val;
	} variables[NUMVARS]; /* or make it a linked list if it grows */

And then read stuff in, putting the names into the variables[n].nam
members and putting values in the variables[n].val integers, then look
them up by just searching the array, or creating a hash table system
to look them up directly.  There's no way to create a new symbol after
C has been compiled; besides, this method is a lot like the way LISP
interns symbols and associates them with values in the first place.
:-)

--
______________________________________________________________________
			\					
 robert earl		/	"Love is a many splintered thing"
 rearl@watnxt3.ucr.edu	\		--Sisters of Mercy
 rearl@gnu.ai.mit.edu	/