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Fix: Correct precision calculation for floating point formatting (#2657)

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* Fix: Correct precision calculation for floating point formatting

---------

Signed-off-by: Manuel Barrio Linares <mbarriolinares@gmail.com>
Co-authored-by: Christoffer Lerno <christoffer@aegik.com>
This commit is contained in:
Manu Linares
2025-12-19 11:51:42 -03:00
committed by GitHub
parent 29bcd2c96e
commit dec49b05b8
3 changed files with 29 additions and 1 deletions
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24
test/unit/stdlib/core/formatter.c3
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@@ -17,4 +17,28 @@ fn void test_ref() @test
String s = string::format(mem, "%s %s %s %s %s", a, b, f0, f, *f);
defer free(s);
assert(s == "0x40 0x0 (null) Foo[8] Foo[8]");
double d1 = 6.62607015e-34d;
double d2 = 0.0d;
double d3 = -0.0d;
double d4 = double.inf;
double d5 = -double.inf;
double d6 = -4.932096661796888e-226d;
double d7 = 3.439070283483335e+35d;
double d8 = 6.606854224493745e-17d;
double d9 = 6.079537928711555e+61d;
String s2 = string::format(mem, "%.9g %g %g %g %g %.16g %.16g %.16g %.16g", d1, d2, d3, d4, d5, d6, d7, d8, d9);
defer free(s2);
test::eq(s2, "6.62607015e-34 0 -0 inf -inf -4.932096661796888e-226 3.439070283483335e+35 6.606854224493745e-17 6.079537928711555e+61");
double t1 = 12345.9d;
double t2 = 0.00087654d;
double t3 = 1234567.0d;
double t4 = 12.345d;
double t5 = 12.3d;
double t6 = 0.9999999d;
double t7 = 3.141592653589793d;
String s3 = string::format(mem, "%.3e %.3e %.4g %.4g %#.4g %.3f %.15f", t1, t2, t3, t4, t5, t6, t7);
defer free(s3);
assert(s3 == "1.235e+04 8.765e-04 1.235e+06 12.35 12.30 1.000 3.141592653589793");
}