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Key idea is using double precision calculations makes everything better

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Print 9 digits
This commit is contained in:
jsalling
2016-11-03 23:56:32 -05:00
parent e48fe0a07c
commit 2de0e8285d
1 changed files with 10 additions and 8 deletions
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18
src/unity.c
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@ -255,7 +255,7 @@ void UnityPrintMask(const _U_UINT mask, const _U_UINT number)
/*
* char buffer[19];
* if (number > 4294967296.0 || -number > 4294967296.0)
* snprintf(buffer, sizeof buffer, "%.6e", number);
* snprintf(buffer, sizeof buffer, "%.8e", number);
* else
* snprintf(buffer, sizeof buffer, "%.6f", number);
* UnityPrint(buffer);
@ -276,7 +276,8 @@ void UnityPrintFloat(_UD number)
_UU32 integer_part = (_UU32)number;
_UD fraction_part = number - integer_part;
_U_UINT fraction_bits = (_U_UINT)(fraction_part * 1000000.0f + 0.5f);
_U_UINT fraction_bits = (_U_UINT)(fraction_part * 1000000.0 + 0.5);
/* Double precision calculation gives best performance for six rounded decimal places */
if (fraction_bits == 1000000)
{
@ -299,24 +300,25 @@ void UnityPrintFloat(_UD number)
else /* Won't fit in an integer type */
{
_UU32 integer_part;
_UD divide = 10.0f;
_U_UINT exponent = 7;
double divide = 10.0;
_U_UINT exponent = 9;
while (number / divide >= 10000000.0f)
while (number / divide >= 1000000000.0)
{
divide *= 10;
exponent++;
}
integer_part = (_UU32)(number / divide + 0.5f);
integer_part = (_UU32)(number / divide + 0.5);
/* Double precision calculation required for float, to produce 9 rounded digits */
_UU32 divisor = 1000000;
_UU32 divisor = 100000000;
do
{
UNITY_OUTPUT_CHAR((char)('0' + (integer_part / divisor)));
integer_part %= divisor;
divisor /= 10;
if (divisor == 100000) UNITY_OUTPUT_CHAR('.');
if (divisor == 10000000) UNITY_OUTPUT_CHAR('.');
} while (divisor > 0);
UNITY_OUTPUT_CHAR('e');
UNITY_OUTPUT_CHAR('+');