FA-17129 / Floating-point arithmetic / Member archive

Engineering notation truncates negative exponent division · case 04

Engineering notation truncates negative exponent division.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Render a finite decimal text after half-even rounding to precision, in scientific or engineering notation. Preserve coefficient trailing zeros; engineering exponent is a multiple of three with one to three integer digits. Zero is canonical coefficient zero with original sign and exponent zero.

Why this case matters

An offline floating representation model isolates a reproducible arithmetic fault.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
negative exponent	`"12.3e0"`	`"12.3e-3"`	Failed

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