From the preface to the second edition of The C Programming Language by Brian W. Kernighan and Dennis M. Ritchie:

We used Bjarne Stroustrup's C++ translator extensively for local testing of our programs, and Dave Kristol provided us with an ANSI C compiler for final testing.
From section 1.6 (C and C++) of the third edition of The C++ Programming Language by Bjarne Stroustrup:
However, good C programs tend to be C++ programs. For example, every program in Kernighan and Ritchie, The C Programming Language (2nd Edition) [Kernighan,1988], is a C++ program.
Is there a single word to express "referring to each other"?

Here is an extract from page 26, section 'Babbage, Computers, Artificial Intelligence ...' in 'Introduction: A Musico-Logical Offering' of the book Gödel, Escher, Bach: An Eternal Golden Braid written by Douglas R. Hofstadter:

But essential abilities for intelligence are certainly:
  1. to respond to situations very flexibly;
  2. to take advantage of fortuitous circumstances;
  3. to make sense out of ambiguous or contradictory messages;
  4. to recognize the relative importance of different elements of a situation;
  5. to find similarities between situations despite differences which may separate them;
  6. to draw distinctions between situations despite similarities which may link them;
  7. to synthesize new concepts by taking old concepts and putting them together in new ways;
  8. to come up with ideas which are novel.

From page 104 (Chapter 4 - Mathematics and Reality, Mechanizing Mathematics) of The Mind of God by Paul Davies:

John Barrow has remarked wryly that, if a religion is defined to be a system of thought which requires belief in unprovable truths, then mathematics is the only religion that can prove it is a religion.

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