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string-format: String.format/formatted/printf cheat sheet module (specifier anatomy, rounding vs C printf, locales, Indian lakh/crore grouping Formatter cannot do, format exceptions, %t dates, concat cost), 11 contract tests

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7Sr2zcoRD2watXv1G
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Claude
2026-11-12 11:00:22 +05:30
parent db129fb1ce
commit 319697c345
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string-format/output/03-rounding.txt
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value %.1f %.2f exact binary value BigDecimal(HALF_EVEN,2)
0.125 0.1 0.13 0.125 0.12
0.25 0.3 0.25 0.25 0.25
0.35 0.4 0.35 0.34999999999999997779 0.35
2.675 2.7 2.68 2.67499999999999982236 2.67
1.005 1.0 1.01 1.00499999999999989341 1.00
0.5 0.5 0.50 0.5 0.50
1.5 1.5 1.50 1.5 1.50
2.5 2.5 2.50 2.5 2.50
== %.0f on halves: HALF_UP, away from zero ==
1 2 3 -3
== same number, three routes: %f rounds what it is given ==
double 2.675 -> 2.68
new BigDecimal("2.675") -> 2.68
new BigDecimal(2.675) -> 2.67