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Note that the value of the Boolean expression, n != 0, is
0, meaning false, if and only if the value of n is
0. Accordingly, the following while statements are
equivalent:
while (n != 0) ... while (n) ...
Thus, testing n to see whether it is not 0 is viewed by some
C programmers as a form of lily gilding; such programmers use
n rather than n != 0.
Other C programmers much prefer n != 0, because they believe that
it is important to maintain a visible distinction between 0 viewed
as a number and 0 viewed as a truth value.