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From: Mild Shock <janburse@fastmail.fm>
Newsgroups: comp.lang.prolog
Subject: format/2 doesn't agree with Trealla or SWI (Was: Is old school mode
 directed compilation dead?)
Date: Sat, 25 Jan 2025 14:13:33 +0100
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Possibly it does round away from zero and not half-even:

/* Trealla Prolog 2.63.33 & SWI-Prolog 9.0.4 */
?- format('~0f ~0f', [1.5, 2.5]), nl.
2 2

/* Scryer Prolog 0.9.4-286 */
?- format("~0f ~0f", [1.5, 2.5]), nl.
1 2

Pitty there is no Prolog Improvement Proposals (PIP) for format/2.

https://prolog-lang.org/ImplementersForum/PIPs