Math.Ceiling Method (Double)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Returns the smallest integral value greater than or equal to the specified double-precision floating-point number.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- a
- Type: System.Double
A double-precision floating-point number.
Return Value
Type: System.DoubleThe smallest integral value greater than or equal to a. If a is equal to NaN, NegativeInfinity, or PositiveInfinity, that value is returned. Note that the method returns a Double rather than an integral type.
The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called rounding toward positive infinity. In other words, if a is positive, the presence of any fractional component causes a to be rounded to the next highest integer. If a is negative, the rounding operation causes any fractional component of a to be discarded. The operation of this method differs from the Floor method, which supports rounding toward negative infinity.
The following example illustrates the Ceiling method and contrasts it with the Floor method.
double[] values = { 7.03, 7.64, 0.12, -0.12, -7.1, -7.6 }; outputBlock.Text += " Value Ceiling Floor\n" + "\n"; foreach (double value in values) outputBlock.Text += String.Format("{0,7} {1,16} {2,14}", value, Math.Ceiling(value), Math.Floor(value)) + "\n"; // The example displays the following output: // Value Ceiling Floor // // 7.03 8 7 // 7.64 8 7 // 0.12 1 0 // -0.12 0 -1 // -7.1 -7 -8 // -7.6 -7 -8