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Merge pull request #67463 from aaronfranke/num-real-negative

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Fix big negative numbers printing incorrect decimals in `num_real`
This commit is contained in:
Rémi Verschelde 2022-10-17 17:31:47 +02:00
commit fde8838316
2 changed files with 9 additions and 4 deletions
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9
core/string/ustring.cpp
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@ -1567,10 +1567,11 @@ String String::num_real(double p_num, bool p_trailing) {
#else
int decimals = 6;
#endif
// We want to align the digits to the above sane default, so we only
// need to subtract log10 for numbers with a positive power of ten.
if (p_num > 10) {
decimals -= (int)floor(log10(p_num));
// We want to align the digits to the above sane default, so we only need
// to subtract log10 for numbers with a positive power of ten magnitude.
double abs_num = Math::abs(p_num);
if (abs_num > 10) {
decimals -= (int)floor(log10(abs_num));
}
return num(p_num, decimals);
}

4
tests/core/string/test_string.h
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@ -411,9 +411,13 @@ TEST_CASE("[String] Number to string") {
CHECK(String::num_real(3.141593) == "3.141593");
CHECK(String::num_real(3.141) == "3.141"); // No trailing zeros.
#ifdef REAL_T_IS_DOUBLE
CHECK_MESSAGE(String::num_real(123.456789) == "123.456789", "Prints the appropriate amount of digits for real_t = double.");
CHECK_MESSAGE(String::num_real(-123.456789) == "-123.456789", "Prints the appropriate amount of digits for real_t = double.");
CHECK_MESSAGE(String::num_real(Math_PI) == "3.14159265358979", "Prints the appropriate amount of digits for real_t = double.");
CHECK_MESSAGE(String::num_real(3.1415f) == "3.1414999961853", "Prints more digits of 32-bit float when real_t = double (ones that would be reliable for double) and no trailing zero.");
#else
CHECK_MESSAGE(String::num_real(123.456789) == "123.4568", "Prints the appropriate amount of digits for real_t = float.");
CHECK_MESSAGE(String::num_real(-123.456789) == "-123.4568", "Prints the appropriate amount of digits for real_t = float.");
CHECK_MESSAGE(String::num_real(Math_PI) == "3.141593", "Prints the appropriate amount of digits for real_t = float.");
CHECK_MESSAGE(String::num_real(3.1415f) == "3.1415", "Prints only reliable digits of 32-bit float when real_t = float.");
#endif // REAL_T_IS_DOUBLE