I use this function.. it is based on source from an old post to this forum:
void FloatToString (double value, char * buffer, int round)
{
// this function came from a combination of Thiago Rossato and
// Noah Young via the Palm Developer Forum
long iValue;
float dDecimal;
long iDecValue;
int i;
char sResult[50];
char sDecimal[50];
iValue = value;
dDecimal = value - iValue;
// if dDecimal >= 1, then iValue should actually be greater by dDecimal
// this happens in situations of numbers that can't be accurately
// represented as a double.. (7 is 6.9999999997, but dDecimal is 1 after
// the above)
if (dDecimal >= 1)
{
i = dDecimal;
iValue = iValue + i;
dDecimal = dDecimal - i;
}
// Make sure rounding will still work if value is negative
if (value < 0)
dDecimal = -dDecimal;
if (dDecimal < 0.000000001) dDecimal = 0;
if (!round && dDecimal >= 0.5) iValue++;
// Convert integer portion to string
StrIToA(sResult, iValue);
if (StrLen(sResult) < 1) StrCopy(sResult, "0");
if (round)
{
StrCat(sResult, ".");
// Round decimal portion
for (i = 1; i <= round; i++)
dDecimal = dDecimal * 10;
iDecValue = dDecimal;
if (dDecimal - iDecValue >= 0.5) iDecValue++;
// Add decimal portion
StrIToA (sDecimal, iDecValue);
// Add leading zeros if neccessary
if (StrLen (sDecimal) < round)
for (i = 1; i <= round - StrLen(sDecimal); i++)
StrCat (sResult, "0");
StrCat (sResult, sDecimal);
}
// Copy into return string
StrCopy (buffer, sResult);
}
--
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