# Math.Ceiling Method (Double)

**Visual Studio 2010**

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

**Namespace:**System

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

#### Parameters

- a
- Type: System.Double

A double-precision floating-point number.

#### Return Value

Type: System.DoubleThe smallest integral value that is greater than or equal to a. If a is equal to NaN, NegativeInfinity, or PositiveInfinity, that value is returned. Note that this method returns a Double instead of 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(Double) method, which supports rounding toward negative infinity.

The following example illustrates the Math.Ceiling(Double) method and contrasts it with the Floor(Double) method.

double[] values = {7.03, 7.64, 0.12, -0.12, -7.1, -7.6}; Console.WriteLine(" Value Ceiling Floor\n"); foreach (double value in values) Console.WriteLine("{0,7} {1,16} {2,14}", value, Math.Ceiling(value), Math.Floor(value)); // The example displays the following output to the console: // 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.