Convert.ToDouble Method (Single) (System)

.NET Framework Class Library

Convert..::.ToDouble Method (Single)

Converts the value of the specified single-precision floating-point number to an equivalent double-precision floating-point number.

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

Syntax

Visual Basic (Declaration)

Public Shared Function ToDouble ( _
    value As Single _
) As Double

Visual Basic (Usage)

Dim value As Single
Dim returnValue As Double

returnValue = Convert.ToDouble(value)

public static double ToDouble(
    float value
)

Visual C++

public:
static double ToDouble(
    float value
)

JScript

public static function ToDouble(
    value : float
) : double

Parameters

value: Type: System..::.Single
The single-precision floating-point number.

Return Value

Type: System..::.Double
A double-precision floating-point number that is equivalent to value.

Examples

The following example converts a Single value to a Double value.

Visual Basic

Public Sub CovertDoubleFloat(ByVal doubleVal As Double)
    Dim singleVal As Single = 0

    ' Double to Single conversion cannot overflow.
        singleVal = System.Convert.ToSingle(doubleVal)
        System.Console.WriteLine("{0} as a Single is {1}", _
                                  doubleVal, singleVal)

    ' Conversion from Single to Double cannot overflow.
    doubleVal = System.Convert.ToDouble(singleVal)
    System.Console.WriteLine("{0} as a Double is: {1}", _
                              singleVal, doubleVal)
End Sub

        public void CovertDoubleFloat(double doubleVal) {    
            float floatVal = 0;

            // Double to float conversion cannot overflow.
                floatVal = System.Convert.ToSingle(doubleVal);
                System.Console.WriteLine("{0} as a float is {1}",
                    doubleVal, floatVal);

            // Conversion from float to double cannot overflow.
            doubleVal = System.Convert.ToDouble(floatVal);
            System.Console.WriteLine("{0} as a double is: {1}",
                floatVal, doubleVal);
        }

Visual C++

public:
   void CovertDoubleFloat( double doubleVal )
   {
      float floatVal = 0;

      // A conversion from Double to Single cannot overflow.
      floatVal = System::Convert::ToSingle( doubleVal );
      System::Console::WriteLine( " {0} as a float is {1}",
                                  doubleVal, floatVal );

      // A conversion from Single to Double cannot overflow.
      doubleVal = System::Convert::ToDouble( floatVal );
      System::Console::WriteLine( " {0} as a double is: {1}",
                                  floatVal, doubleVal );
   }

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Reference