OT: Requesting C advice

Mike McCarty Mike.McCarty at sbcglobal.net
Fri Jun 1 00:57:17 UTC 2007

Matthew Saltzman wrote:
> On Thu, 31 May 2007, Mike McCarty wrote:

[in regards to initializing statically allocated variables]

>> IIRC, it was mentioned in K&R v1.
> My K&R1 is lost to history 8^(, but my H&S 3rd edition spent a lot of 

So is mine :-(

> space on the difference between "traditional" or "K&R" and ANSI 
> compilers. In the section on default initialization the only static vars 
> that were *not* required to be initialized in traditional compilers were 
> unions. The note says that some traditional compilers would not permit 
> such initializations.  The ANSI requirement is that the union be 
> initialized to the default for the first element.
> The other note was that some traditional compilers would initialize a 
> static float/double to all-bits-zero, even if that was not the 
> representation of 0.0.  That's not permitted in ANSI C.

Thank you for the clarification. Also not permitted in ANSI C
is the initialization of pointers to all-bits-zero if that
is not (one of the permitted) values of NULL.

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