diff options
| -rw-r--r-- | core/string/ustring.cpp | 25 | ||||
| -rw-r--r-- | tests/test_string.h | 12 |
2 files changed, 27 insertions, 10 deletions
diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp index 8416ff929e..daeb7fbd17 100644 --- a/core/string/ustring.cpp +++ b/core/string/ustring.cpp @@ -1551,19 +1551,21 @@ String String::num_real(double p_num, bool p_trailing) { bool neg = p_num < 0; p_num = ABS(p_num); - int intn = (int)p_num; + int64_t intn = (int64_t)p_num; // Decimal part. if (intn != p_num) { - double dec = p_num - (double)(intn); + double dec = p_num - (double)intn; int digit = 0; -#if REAL_T_IS_DOUBLE +#ifdef REAL_T_IS_DOUBLE int decimals = 14; + double tolerance = 1e-14; #else int decimals = 6; + double tolerance = 1e-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. @@ -1575,16 +1577,21 @@ String String::num_real(double p_num, bool p_trailing) { decimals = MAX_DECIMALS; } - int dec_int = 0; - int dec_max = 0; + // In case the value ends up ending in "99999", we want to add a + // tiny bit to the value we're checking when deciding when to stop, + // so we multiply by slightly above 1 (1 + 1e-7 or 1e-15). + double check_multiplier = 1 + tolerance / 10; + + int64_t dec_int = 0; + int64_t dec_max = 0; while (true) { dec *= 10.0; - dec_int = dec_int * 10 + (int)dec % 10; + dec_int = dec_int * 10 + (int64_t)dec % 10; dec_max = dec_max * 10 + 9; digit++; - if ((dec - (double)((int)dec)) < 1e-6) { + if ((dec - (double)(int64_t)(dec * check_multiplier)) < tolerance) { break; } @@ -1594,7 +1601,7 @@ String String::num_real(double p_num, bool p_trailing) { } dec *= 10; - int last = (int)dec % 10; + int last = (int64_t)dec % 10; if (last > 5) { if (dec_int == dec_max) { @@ -3555,7 +3562,7 @@ String String::strip_edges(bool left, bool right) const { } if (right) { - for (int i = (int)(len - 1); i >= 0; i--) { + for (int i = len - 1; i >= 0; i--) { if (operator[](i) <= 32) { end--; } else { diff --git a/tests/test_string.h b/tests/test_string.h index bcedaa0db7..c1b7220fdb 100644 --- a/tests/test_string.h +++ b/tests/test_string.h @@ -355,13 +355,23 @@ TEST_CASE("[String] Number to string") { CHECK(String::num(-0.0) == "-0"); // Includes sign even for zero. CHECK(String::num(3.141593) == "3.141593"); CHECK(String::num(3.141593, 3) == "3.142"); - CHECK(String::num_real(3.141593) == "3.141593"); CHECK(String::num_scientific(30000000) == "3e+07"); CHECK(String::num_int64(3141593) == "3141593"); CHECK(String::num_int64(0xA141593, 16) == "a141593"); CHECK(String::num_int64(0xA141593, 16, true) == "A141593"); CHECK(String::num(42.100023, 4) == "42.1"); // No trailing zeros. + // String::num_real tests. + 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(Math_PI) == "3.14159265358979", "Prints the appropriate amount of digits for real_t = double."); + CHECK_MESSAGE(String::num_real(3.1415f) == "3.14149999618530", "Prints more digits of 32-bit float when real_t = double (ones that would be reliable for double)."); +#else + 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 + // Checks doubles with many decimal places. CHECK(String::num(0.0000012345432123454321, -1) == "0.00000123454321"); // -1 uses 14 as sane default. CHECK(String::num(0.0000012345432123454321) == "0.00000123454321"); // -1 is the default value. |