# 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)

## Syntax

```[SecuritySafeCriticalAttribute]
public static double Ceiling(
double a
)
```

#### Parameters

a
Type: System.Double
A double-precision floating-point number.

#### Return Value

Type: System.Double
The 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.

## Remarks

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.

## Examples

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

```

## Version Information

#### Silverlight

Supported in: 5, 4, 3

#### Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

#### XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

## Platforms

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