> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:ibm-m...@bama.ua.edu] On Behalf Of Thomas David Rivers > Sent: Wednesday, May 19, 2010 8:40 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: partially initialized structures in C > > Bernd, > > That sounds like a compiler bug, but more detail would > be needed to be sure. > > The ANSI C standard basically works like this: > > A structure initialized a file scope (static or not) will be > initialized to all zeros. > > If the structure is being initialized within a function > (at automatic scope) then the requirement is that it be > initialized the same as if it were done at file scope, > which basically means if you initialize part of it, you > have to initialize the "holes" with 0. > > I'm surprise the IBM documentation would indicate > that a partial aggregate initialization only partially > initializes - can you point me to the pertinent > phrases in the IBM doc? The requirement to initialize > the remainder of the aggregate with zeros has been > around since the very first ANSI C standard. > > - Dave Rivers -
Ref: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/CBCLR190/4.6.3 <quote> You do not have to initialize all members of a structure or union; the initial value of uninitialized structure members depends on the storage class associated with the structure or union variable. In a structure declared as static, any members that are not initialized are implicitly initialized to zero of the appropriate type; the members of a structure with automatic storage have no default initialization. The default initializer for a union with static storage is the default for the first component; a union with automatic storage has no default initialization. </quote> -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
