In the special case of a substance isolated from external heat supply, dH=o, the change of entropy is zero in a reversible process, but must be positive if the process is not reversible.
Use of truncation toward zero in implicit conversion has not always been guaranteed in C either, by the way.
The significant figures of a number are those which commence with the first figure other than zero in the number; thus the significant figures of 13 027 and of 0001-3027 are the same.
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