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.


Begin forwarded message:

From: Leo Broukhis <>
Subject: [Simh] An abandoned piece of K&R C
Date: 2017, November 3 at 1:14:42 AM EDT
To: "" <>

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))
    goto unkn;

case DIVIDE:
    if (subseq('\\', 0, 1))

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?


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