Well, somebody had to have done it!
On Fri, Nov 3, 2017 at 1:22 PM, Larry Stewart <l.s...@stewart.org> wrote: > I took the liberty of cross posting this earlier to TUHS and I got > an authoritative answer :) > -Larry > > > Begin forwarded message: > > *From: *Ken Thompson <k...@google.com> > *Subject: **Re: [TUHS] Fwd: [Simh] An abandoned piece of K&R C* > *Date: *2017, November 3 at 2:30:08 PM EDT > *To: *Lawrence Stewart <stew...@serissa.com> > > it's news to me. > > > On Fri, Nov 3, 2017 at 5:53 AM, Lawrence Stewart <stew...@serissa.com> > wrote: > > This caught my attention. Did early C really have min and max? Were they > used for anything? In those days I was a BCPL user, which IIRC, did not > have such things. > > -Larry > > Begin forwarded message: > > From: Leo Broukhis <l...@mailcom.com> > Subject: [Simh] An abandoned piece of K&R C > Date: 2017, November 3 at 1:14:42 AM EDT > To: "simh@trailing-edge.com" <simh@trailing-edge.com> > > https://retrocomputing.stackexchange.com/q/4965/4025 > > > In the UNIX V7 version of the C language, there were the /\ (min) and the > \/ > (max) operators. In the source of the scanner part of the compiler, > > case BSLASH: > if (subseq('/', 0, 1)) > return(MAX); > goto unkn; > > case DIVIDE: > if (subseq('\\', 0, 1)) > return(MIN); > ... > > However, attempting to use them reveals that the corresponding part in the > code generator is missing. Trying to compile > > foo(a, b) { return a \/ b; } > > results in > > 1: No code table for op: \/ > > The scanner piece survived in the copies of the compiler for various > systems > for several years. I tried to look for copies of the code generator table > which would contain an implementation, but failed. Has anyone ever seen a > working MIN/MAX operator in K&R C? > > Thanks,Leo > > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh > > > > > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh >
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