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Print small floats instead of 0 #856

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1 change: 1 addition & 0 deletions docs/UnityChangeLog.md
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ Significant Bugfixes:

- Default `UNITY_INCLUDE_EXEC_TIME` macros compile as ISO C99, are statement-safe, and accept `-Wsign-conversion` (#838)
- `unity_test_summary.rb` honors its own default result directory and root path again. @youdie006
- Floats and doubles smaller than `UNITY_FLOAT_PRECISION` or `UNITY_DOUBLE_PRECISION` print as their value again instead of `0`. @APX403

### Unity 2.7.0 (July 2026)

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4 changes: 1 addition & 3 deletions src/unity.c
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Expand Up @@ -367,18 +367,16 @@ void UnityPrintFloat(const UNITY_DOUBLE input_number)
static const int sig_digits = 9;
static const UNITY_INT32 min_scaled = 100000000;
static const UNITY_INT32 max_scaled = 1000000000;
static const UNITY_DOUBLE epsilon = UNITY_DOUBLE_PRECISION;
#else
static const int sig_digits = 7;
static const UNITY_INT32 min_scaled = 1000000;
static const UNITY_INT32 max_scaled = 10000000;
static const UNITY_DOUBLE epsilon = UNITY_FLOAT_PRECISION;
#endif

UNITY_DOUBLE number = input_number;

/* handle zero, NaN, and +/- infinity */
if (UNITY_ABS(number) < epsilon)
if ((number >= 0.0f) && (number <= 0.0f))
{
UnityPrint("0");
}
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4 changes: 4 additions & 0 deletions test/tests/test_unity_doubles.c
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Expand Up @@ -1249,11 +1249,15 @@ void testDoublePrinting(void)
TEST_ASSERT_EQUAL_PRINT_FLOATING("7e+100", 7.0e+100);
TEST_ASSERT_EQUAL_PRINT_FLOATING("3e+200", 3.0e+200);
TEST_ASSERT_EQUAL_PRINT_FLOATING("9.23456789e+300", 9.23456789e+300);
TEST_ASSERT_EQUAL_PRINT_FLOATING("4.99e-13", 4.99e-13);
TEST_ASSERT_EQUAL_PRINT_FLOATING("7e-100", 7.0e-100);

TEST_ASSERT_EQUAL_PRINT_FLOATING("-0.1004695", -0.10046949999999999);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.2949673e+09", -4294967295.9);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.2949673e+09", -4294967296.0);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-7e+100", -7.0e+100);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-4.99e-13", -4.99e-13);
TEST_ASSERT_EQUAL_PRINT_FLOATING("-7e-100", -7.0e-100);
#endif
}

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