Because the "for" statement parameters initialize "c" to 1, there is actually no way for "c" to ever be 0 at that point. "c" is not an argument to the program, it is just a local variable.
Of course, a good optimizer will eliminate the superfluous test as "always true" and generate no code for it. If someone invokes the program (from wherever) with no arguments, "argc" will be zero and the for loop will not execute at all, so the "if" statement will never be executed in that case. HTH Peter -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of John McKown Sent: Monday, July 29, 2013 6:28 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Establishing and using Unix file system and USS under z/OS I don't think that it can if the code is invoked from the shell itself. But it could be if someone did an exec() passing in a 0. Why would they do that? I don't know of any reason. On Mon, Jul 29, 2013 at 5:01 PM, retired mainframer < retired-mainfra...@q.com> wrote: > :>: -----Original Message----- > :>: From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On > :>: Behalf Of Ze'ev Atlas > :>: Sent: Monday, July 29, 2013 6:55 AM > :>: To: IBM-MAIN@LISTSERV.UA.EDU > :>: Subject: Re: Establishing and using Unix file system and USS under z/OS > > <snip> > > :>: main(int argc, char *argv[]) > :>: { > :>: int c; > :>: int d; > :>: int i; > :>: FILE * mypds; > :>: > :>: for ( c = 1 ; c < argc ; c++) > :>: { > :>: if (c > 0) > > Can this ever be false? -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
