# Math.Ceiling Method

**Silverlight**

Returns the smallest integral value greater than or equal to the specified double-precision floating-point number.

**Namespace:**System

**Assembly:**mscorlib (in mscorlib.dll)

'Declaration <SecuritySafeCriticalAttribute> _ Public Shared Function Ceiling ( _ a As Double _ ) As Double

#### 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.

Dim values() As Double = {7.03, 7.64, 0.12, -0.12, -7.1, -7.6} outputBlock.Text &= " Value Ceiling Floor" & vbCrLf outputBlock.Text &= vbCrLf For Each value As Double In values outputBlock.Text += String.Format("{0,7} {1,16} {2,14}", _ value, Math.Ceiling(value), Math.Floor(value)) & vbCrLf Next ' 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

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.