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arithmetic: companion code for the Add Two Numbers Without Overflow post

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Silent int/long overflow reproduced with real numbers, the Math *Exact()
family (addExact/subtractExact/multiplyExact/incrementExact/decrementExact/
negateExact/toIntExact/absExact) with the abs(MIN_VALUE) trap absExact
exists to catch, widening to long vs BigInteger, and the XOR-based overflow
bit trick Math.addExact uses internally, cross-checked against BigInteger
ground truth over 100k random int pairs per JUnit repeat.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
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asmhatre
2026-09-30 09:16:49 +00:00
co-authored by Claude Sonnet 5
parent 202f2f18a5
commit af615cc17c
15 changed files with 514 additions and 0 deletions
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arithmetic/output/05-correctness-tests.txt
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-------------------------------------------------------------------------------
Test set: com.ankurm.arithmetic.ArithmeticClaimsTest
-------------------------------------------------------------------------------
Tests run: 14, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.438 s -- in com.ankurm.arithmetic.ArithmeticClaimsTest