| private static ThisobToDouble ( Object thisob ) : double | ||
| thisob | Object | |
| return | double | |
public static String toExponential(Object thisob, Object fractionDigits)
{
double value = NumberPrototype.ThisobToDouble(thisob);
double f;
if (fractionDigits == null || fractionDigits is Missing)
{
f = 16;
}
else
{
f = Convert.ToInteger(fractionDigits);
}
if (f < 0 || f > 20)
{
throw new JScriptException(JSError.FractionOutOfRange);
}
StringBuilder fmt = new StringBuilder("#.");
for (int i = 0; i < f; i++)
{
fmt.Append('0');
}
fmt.Append("e+0");
return(value.ToString(fmt.ToString(), CultureInfo.InvariantCulture));
}
public static String toPrecision(Object thisob, Object precision)
{
double value = NumberPrototype.ThisobToDouble(thisob);
if (precision == null || precision is Missing)
{
return(Convert.ToString(value));
}
double df = Convert.ToInteger(precision);
if (df < 1 || df > 21)
{
throw new JScriptException(JSError.PrecisionOutOfRange);
}
int f = (int)df;
if (Double.IsNaN(value))
{
return("NaN");
}
if (Double.IsInfinity(value))
{
return(value > 0.0 ? "Infinity" : "-Infinity");
}
String sign;
if (value >= 0.0)
{
sign = "";
}
else
{
sign = "-";
value = -value;
}
String mant = value.ToString("e" + (f - 1).ToString(), CultureInfo.InvariantCulture);
int exp = Int32.Parse(mant.Substring(mant.Length - 4), CultureInfo.InvariantCulture);
mant = mant.Substring(0, 1) + mant.Substring(2, f - 1);
if (exp >= f || exp < -6)
{
return(sign + mant.Substring(0, 1) + (f > 1 ? "." + mant.Substring(1) : "")
+ (exp >= 0 ? "e+" : "e") + exp.ToString());
}
if (exp == f - 1)
{
return(sign + mant);
}
if (exp >= 0)
{
return(sign + mant.Substring(0, exp + 1) + "." + mant.Substring(exp + 1));
}
return(sign + "0." + mant.PadLeft(f - exp - 1, '0'));
}
public static String toFixed(Object thisob, double fractionDigits)
{
double value = NumberPrototype.ThisobToDouble(thisob);
if (Double.IsNaN(fractionDigits))
{
fractionDigits = 0;
}
else if (fractionDigits < 0 || fractionDigits > 20)
{
throw new JScriptException(JSError.FractionOutOfRange);
}
return(value.ToString("f" + ((int)fractionDigits).ToString(CultureInfo.InvariantCulture), CultureInfo.InvariantCulture));
}