Math::Round Method (Double, Int32)
Rounds a double-precision floating-point value to a specified number of fractional digits.
Assemblies: mscorlib (in mscorlib.dll)
System.Runtime.Extensions (in System.Runtime.Extensions.dll)
- Type: System::Double
A double-precision floating-point number to be rounded.
- Type: System::Int32
The number of fractional digits in the return value.
Return ValueType: System::Double
The number nearest to value that contains a number of fractional digits equal to digits.
For examples and comprehensive usage information about this and other overloads of the Round method, see the Round reference page.
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 method may not appear to round midpoint values to the nearest even value in the digits decimal position. This is illustrated in the following example, where 2.135 is rounded to 2.13 instead of 2.14. This occurs because internally the method multiplies value by 10digits, and the multiplication operation in this case suffers from a loss of precision.