Round Method (Double)

Math.Round Method (Double)


Rounds a double-precision floating-point value to the nearest integral value.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

static member Round : 
        a:float -> float


Type: System.Double

A double-precision floating-point number to be rounded.

Return Value

Type: System.Double

The integer nearest a. If the fractional component of a is halfway between two integers, one of which is even and the other odd, then the even number is returned. Note that this method returns a Double instead of an integral type.


For examples and comprehensive usage information about this and other overloads of the Round method, see the Round reference page.

Notes to Callers:

Because of the loss of precision that can result from representing decimal values as floating-point numbers or performing arithmetic operations on floating-point values, in some cases the Round(Double) method may not appear to round midpoint values to the nearest even integer. In the following example, because the floating-point value .1 has no finite binary representation, the first call to the Round(Double) method with a value of 11.5 returns 11 instead of 12.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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