| private static TryParseSingle ( byte chars, int offset, int count, float &result ) : bool | ||
| chars | byte | |
| offset | int | |
| count | int | |
| result | float | |
| Résultat | bool | |
private static bool TryParseSingle(byte[] chars, int offset, int count, out float result)
{
result = 0;
int offsetMax = offset + count;
bool negative = false;
if (offset < offsetMax && chars[offset] == '-')
{
negative = true;
offset++;
count--;
}
if (count < 1 || count > 10)
return false;
int value = 0;
int ch;
while (offset < offsetMax)
{
ch = (chars[offset] - '0');
if (ch == ('.' - '0'))
{
offset++;
int pow10 = 1;
while (offset < offsetMax)
{
ch = chars[offset] - '0';
if (((uint)ch) >= 10)
return false;
pow10 *= 10;
value = value * 10 + ch;
offset++;
}
// More than 8 characters (7 sig figs and a decimal) and int -> float conversion is lossy, so use double
if (count > 8)
{
result = (float)((double)value / (double)pow10);
}
else
{
result = (float)value / (float)pow10;
}
if (negative)
result = -result;
return true;
}
else if (((uint)ch) >= 10)
return false;
value = value * 10 + ch;
offset++;
}
// Ten digits w/out a decimal point might have overflowed the int
if (count == 10)
return false;
if (negative)
result = -value;
else
result = value;
return true;
}