Programming Praxis

Recently, I was writing a program where I needed parallel assignment; the details of my program don’t matter. Some languages provide parallel assignment natively; for instance, Python:

Python 2.7.13 (default, Mar 13 2017, 20:56:15)
[GCC 5.4.0] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a,b,c = 1,2,3
>>> print a,b,c
1 2 3
>>> a,b,c = b,c,a
>>> print a,b,c
2 3 1

You can do something similar in C (I think — I’m not sufficiently expert in C to be certain this works):

#define SWAP(x, y) { typeof(x) t = x; x = y; y = t }

Your task is to add parallel assignment to your favorite programming language. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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