Silverlight doesn't have Math.Truncate! ... will this equivalent work?
This works as an equivalent for Math.Truncate
most / all cases:
double x = 1034.45
var truncated = x - Math.Floor(Math.Abs(x));
where truncated == 0.45
?
Updating ...
Thanks for the input people! This works for me:
[TestMethod]
public void ShouldTruncateNumber()
{
double x = -1034.068;
double truncated = ((x < 0) ? -1 : 1) * Math.Floor(Math.Abs(x));
Assert.AreEqual(Math.Truncate(x), truncated, "The expected truncated number is not here");
}
It is too:
[TestMethod]
public void ShouldGetMantissa()
{
double x = -1034.068;
double mantissaValue = ((x < 0) ? -1 : 1) *
(Math.Abs(x) - Math.Floor(Math.Abs(x)));
mantissaValue = Math.Round(mantissaValue, 2);
Assert.AreEqual(-0.07, mantissaValue, "The expected mantissa decimal is not here");
}
+3
rasx
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2 answers
I have no idea if this functionality was introduced in Silverlight 4 or if we just missed it, but Decimal
has a static method forTruncate
public double Truncate(double d)
{
return Convert.ToDouble(Decimal.Truncate(Convert.ToDecimal(d)));
}
+2
Jason loki smith
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Yours truncated
will not get the correct value for negative values x
.
To use Math.Floor to round to zero like Truncate does, just do
static double Truncate(double d)
{
return d > 0 ? Math.Floor(d) : -Math.Floor(-d);
}
+8
Joachim isaksson
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