Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!boulder!jdm
From: jdm@boulder.Colorado.EDU (James D. Meiss)
Newsgroups: comp.sys.mac
Subject: Possible new bug in Think C 4.0 sprintf
Summary: crashes when passed unitialized doubles
Keywords: Think C, sprintf
Message-ID: <13068@boulder.Colorado.EDU>
Date: 23 Oct 89 15:36:54 GMT
Sender: news@boulder.Colorado.EDU
Reply-To: jdm@boulder.Colorado.EDU (James D. Meiss)
Distribution: na
Organization: University of Colorado, Boulder
Lines: 30


	After much hair pulling, I localized a problem
in a program that worked fine under Think C 3, but was
giving difficulties in the new version, using the ANSI
library.

	The problem seems to be the following: Call
sprintf with an unitialized double:

main()
{
	double z;
	char aStr[80];

	/* z = 0.0   <==== include this to prevent crash*/
....
	sprintf(aStr, ".13lf",z);
....
}

	Now you may think this is a stupid thing to do, I'll
probably agree to that, but I don't think it should cause an
odd address error. BTW it doesn't crash in sprintf, but memory
seems to be trashed, and it crashes soon afterwards.

	Has someone else seen this? Is there a fix, other than 
initializing the variable?
									
		Jim Meiss	
		jdm@euclid.Colorado.edu