# Double.CompareToDouble.CompareToDouble.CompareToDouble.CompareTo Method

## Definition

Compares this instance to a specified object or Double object and returns an integer that indicates whether the value of this instance is less than, equal to, or greater than the value of the specified object or Double object.

 CompareTo(Double) CompareTo(Double) CompareTo(Double) CompareTo(Double) Compares this instance to a specified double-precision floating-point number and returns an integer that indicates whether the value of this instance is less than, equal to, or greater than the value of the specified double-precision floating-point number. CompareTo(Object) CompareTo(Object) CompareTo(Object) CompareTo(Object) Compares this instance to a specified object and returns an integer that indicates whether the value of this instance is less than, equal to, or greater than the value of the specified object.

## CompareTo(Double)CompareTo(Double)CompareTo(Double)CompareTo(Double)

Compares this instance to a specified double-precision floating-point number and returns an integer that indicates whether the value of this instance is less than, equal to, or greater than the value of the specified double-precision floating-point number.

``````public:
virtual int CompareTo(double value);``````
``public int CompareTo (double value);``
``````abstract member CompareTo : double -> int
override this.CompareTo : double -> int``````
``Public Function CompareTo (value As Double) As Integer``

#### Parameters

value
Double Double Double Double

A double-precision floating-point number to compare.

#### Returns

A signed number indicating the relative values of this instance and `value`.

Return Value Description
Less than zero This instance is less than `value`. -or- This instance is not a number (NaN) and `value` is a number.
Zero This instance is equal to `value`. -or- Both this instance and `value` are not a number (NaN), PositiveInfinity, or NegativeInfinity.
Greater than zero This instance is greater than `value`. -or- This instance is a number and `value` is not a number (NaN).

### Examples

The following code example demonstrates generic and nongeneric versions of the CompareTo method for several value and reference types.

``````// This example demonstrates the two versions of the
// CompareTo method for several base types.
// The general version takes a parameter of type Object, while the specific
// version takes a type-specific parameter, such as Boolean, Int32, or Double.
using namespace System;

void Show( String^ caption, Object^ var1, Object^ var2, int resultGeneric, int resultNonGeneric )
{
String^ relation;
Console::Write( caption );
if ( resultGeneric == resultNonGeneric )
{
if ( resultGeneric < 0 )
relation = "less than";
else
if ( resultGeneric > 0 )
relation = "greater than";
else
relation = "equal to";
Console::WriteLine( "{0} is {1} {2}", var1, relation, var2 );
}
// The following condition will never occur because the generic and non-generic
// CompareTo methods are equivalent.
else
{
Console::WriteLine( "Generic CompareTo = {0}; non-generic CompareTo = {1}", resultGeneric, resultNonGeneric );
}
}

int main()
{
String^ nl = Environment::NewLine;
String^ msg = "{0}The following is the result of using the generic and non-generic{0}"
"versions of the CompareTo method for several base types:{0}";
Object^ obj; // An Object used to insure CompareTo(Object) is called.

DateTime now = DateTime::Now;

// Time span = 11 days, 22 hours, 33 minutes, 44 seconds
TimeSpan tsX = TimeSpan(11,22,33,44);

// Version = 1.2.333.4
Version^ versX = gcnew Version(  "1.2.333.4" );

// Guid = CA761232-ED42-11CE-BACD-00AA0057B223
Guid guidX = Guid( "{CA761232-ED42-11CE-BACD-00AA0057B223}");
Boolean a1 = true,a2 = true;
Byte b1 = 1,b2 = 1;
Int16 c1 = -2,c2 = 2;
Int32 d1 = 3,d2 = 3;
Int64 e1 = 4,e2 = -4;
Decimal f1 = Decimal(-5.5), f2 = Decimal(5.5);
Single g1 = 6.6f,g2 = 6.6f;
Double h1 = 7.7,h2 = -7.7;
Char i1 = 'A',i2 = 'A';
String^ j1 = "abc", ^j2 = "abc";
DateTime k1 = now,k2 = now;
TimeSpan l1 = tsX,l2 = tsX;
Version^ m1 = versX, ^m2 = gcnew Version(  "2.0" );
Guid n1 = guidX,n2 = guidX;

// The following types are not CLS-compliant.
SByte w1 = 8,w2 = 8;
UInt16 x1 = 9,x2 = 9;
UInt32 y1 = 10,y2 = 10;
UInt64 z1 = 11,z2 = 11;

//
Console::WriteLine( msg, nl );
try
{
Show( "Boolean: ", a1, a2, a1.CompareTo( a2 ), a1.CompareTo( a2 ) );
Show( "Byte:    ", b1, b2, b1.CompareTo( b2 ), b1.CompareTo( b2 ) );
Show( "Int16:   ", c1, c2, c1.CompareTo( c2 ), c1.CompareTo( c2 ) );
Show( "Int32:   ", d1, d2, d1.CompareTo( d2 ), d1.CompareTo( d2 ) );
Show( "Int64:   ", e1, e2, e1.CompareTo( e2 ), e1.CompareTo( e2 ) );
Show( "Decimal: ", f1, f2, f1.CompareTo( f2 ), f1.CompareTo( f2 ) );
Show( "Single:  ", g1, g2, g1.CompareTo( g2 ), g1.CompareTo( g2 ) );
Show( "Double:  ", h1, h2, h1.CompareTo( h2 ), h1.CompareTo( h2 ) );
Show( "Char:    ", i1, i2, i1.CompareTo( i2 ), i1.CompareTo( i2 ) );

// Use an anonymous object to hide the String object.
obj = j2;
Show( "String:  ", j1, j2, j1->CompareTo( j2 ), j1->CompareTo( obj ) );
Show( "DateTime:", k1, k2, k1.CompareTo( k2 ), k1.CompareTo( k2 ) );
Show(  "TimeSpan: ", l1, l2, l1.CompareTo( l2 ), l1.CompareTo( l2 ) );

// Use an anonymous object to hide the Version object.
obj = m2;
Show(  "Version:  ", m1, m2, m1->CompareTo( m2 ), m1->CompareTo( obj ) );
Show(  "Guid:     ", n1, n2, n1.CompareTo( n2 ), n1.CompareTo( n2 ) );

//
Console::WriteLine( "{0}The following types are not CLS-compliant:", nl );
Show( "SByte:   ", w1, w2, w1.CompareTo( w2 ), w1.CompareTo( w2 ) );
Show( "UInt16:  ", x1, x2, x1.CompareTo( x2 ), x1.CompareTo( x2 ) );
Show( "UInt32:  ", y1, y2, y1.CompareTo( y2 ), y1.CompareTo( y2 ) );
Show( "UInt64:  ", z1, z2, z1.CompareTo( z2 ), z1.CompareTo( z2 ) );
}
catch ( Exception^ e )
{
Console::WriteLine( e );
}

}
//     This example displays the following output:
//
//     The following is the result of using the generic and non-generic versions of the
//     CompareTo method for several base types:
//
//     Boolean:  True is equal to True
//     Byte:     1 is equal to 1
//     Int16:    -2 is less than 2
//     Int32:    3 is equal to 3
//     Int64:    4 is greater than -4
//     Decimal:  -5.5 is less than 5.5
//     Single:   6.6 is equal to 6.6
//     Double:   7.7 is greater than -7.7
//     Char:     A is equal to A
//     String:   abc is equal to abc
//     DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
//     TimeSpan: 11.22:33:44 is equal to 11.22:33:44
//     Version:  1.2.333.4 is less than 2.0
//     Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
//     aa0057b223
//
//     The following types are not CLS-compliant:
//     SByte:    8 is equal to 8
//     UInt16:   9 is equal to 9
//     UInt32:   10 is equal to 10
//     UInt64:   11 is equal to 11
``````
``````// This example demonstrates the generic and non-generic versions of the
// CompareTo method for several base types.
// The non-generic version takes a parameter of type Object, while the generic
// version takes a type-specific parameter, such as Boolean, Int32, or Double.

using System;

class Sample
{
public static void Main()
{
string    nl = Environment.NewLine;
string    msg = "{0}The following is the result of using the generic and non-generic{0}" +
"versions of the CompareTo method for several base types:{0}";

DateTime  now = DateTime.Now;
// Time span = 11 days, 22 hours, 33 minutes, 44 seconds
TimeSpan  tsX = new TimeSpan(11, 22, 33, 44);
// Version = 1.2.333.4
Version   versX = new Version("1.2.333.4");
// Guid = CA761232-ED42-11CE-BACD-00AA0057B223
Guid      guidX = new Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}");

Boolean  a1 = true,  a2 = true;
Byte     b1 = 1,     b2 = 1;
Int16    c1 = -2,    c2 = 2;
Int32    d1 = 3,     d2 = 3;
Int64    e1 = 4,     e2 = -4;
Decimal  f1 = -5.5m, f2 = 5.5m;
Single   g1 = 6.6f,  g2 = 6.6f;
Double   h1 = 7.7d,  h2 = -7.7d;
Char     i1 = 'A',   i2 = 'A';
String   j1 = "abc", j2 = "abc";
DateTime k1 = now,   k2 = now;
TimeSpan l1 = tsX,   l2 = tsX;
Version  m1 = versX, m2 = new Version("2.0");
Guid     n1 = guidX, n2 = guidX;

// The following types are not CLS-compliant.
SByte    w1 = 8,     w2 = 8;
UInt16   x1 = 9,     x2 = 9;
UInt32   y1 = 10,    y2 = 10;
UInt64   z1 = 11,    z2 = 11;
//
Console.WriteLine(msg, nl);
try
{
// The second and third Show method call parameters are automatically boxed because
// the second and third Show method declaration arguments expect type Object.

Show("Boolean:  ", a1, a2, a1.CompareTo(a2), a1.CompareTo((Object)a2));
Show("Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo((Object)b2));
Show("Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo((Object)c2));
Show("Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo((Object)d2));
Show("Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo((Object)e2));
Show("Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo((Object)f2));
Show("Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo((Object)g2));
Show("Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo((Object)h2));
Show("Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo((Object)i2));
Show("String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo((Object)j2));
Show("DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo((Object)k2));
Show("TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo((Object)l2));
Show("Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo((Object)m2));
Show("Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo((Object)n2));
//
Console.WriteLine("{0}The following types are not CLS-compliant:", nl);
Show("SByte:    ", w1, w2, w1.CompareTo(w2), w1.CompareTo((Object)w2));
Show("UInt16:   ", x1, x2, x1.CompareTo(x2), x1.CompareTo((Object)x2));
Show("UInt32:   ", y1, y2, y1.CompareTo(y2), y1.CompareTo((Object)y2));
Show("UInt64:   ", z1, z2, z1.CompareTo(z2), z1.CompareTo((Object)z2));
}
catch (Exception e)
{
Console.WriteLine(e);
}
}

public static void Show(string caption, Object var1, Object var2,
int resultGeneric, int resultNonGeneric)
{
string relation;

Console.Write(caption);
if (resultGeneric == resultNonGeneric)
{
if      (resultGeneric < 0) relation = "less than";
else if (resultGeneric > 0) relation = "greater than";
else                        relation = "equal to";
Console.WriteLine("{0} is {1} {2}", var1, relation, var2);
}

// The following condition will never occur because the generic and non-generic
// CompareTo methods are equivalent.

else
{
Console.WriteLine("Generic CompareTo = {0}; non-generic CompareTo = {1}",
resultGeneric, resultNonGeneric);
}
}
}
/*
This example produces the following results:

The following is the result of using the generic and non-generic versions of the
CompareTo method for several base types:

Boolean:  True is equal to True
Byte:     1 is equal to 1
Int16:    -2 is less than 2
Int32:    3 is equal to 3
Int64:    4 is greater than -4
Decimal:  -5.5 is less than 5.5
Single:   6.6 is equal to 6.6
Double:   7.7 is greater than -7.7
Char:     A is equal to A
String:   abc is equal to abc
DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
TimeSpan: 11.22:33:44 is equal to 11.22:33:44
Version:  1.2.333.4 is less than 2.0
Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
aa0057b223

The following types are not CLS-compliant:
SByte:    8 is equal to 8
UInt16:   9 is equal to 9
UInt32:   10 is equal to 10
UInt64:   11 is equal to 11
*/
``````
``````' This example demonstrates the generic and non-generic versions of the
' CompareTo method for several base types.
' The non-generic version takes a parameter of type Object, while the generic
' version takes a type-specific parameter, such as Boolean, Int32, or Double.

Class Sample
Public Shared Sub Main()
Dim nl As String = Environment.NewLine
Dim msg As String = _
"{0}The following is the result of using the generic and non-generic{0}" & _
"versions of the CompareTo method for several base types:{0}"

Dim now As DateTime = DateTime.Now
' Time span = 11 days, 22 hours, 33 minutes, 44 seconds
Dim tsX As New TimeSpan(11, 22, 33, 44)
' Version = 1.2.333.4
Dim versX As New Version("1.2.333.4")
' Guid = CA761232-ED42-11CE-BACD-00AA0057B223
Dim guidX As New Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}")

Dim a1 As [Boolean] = True,    a2 As [Boolean] = True
Dim b1 As [Byte] = 1,          b2 As [Byte] = 1
Dim c1 As Int16 = -2,          c2 As Int16 = 2
Dim d1 As Int32 = 3,           d2 As Int32 = 3
Dim e1 As Int64 = 4,           e2 As Int64 = -4
Dim f1 As [Decimal] = -5.5D,   f2 As [Decimal] = 5.5D
Dim g1 As [Single] = 6.6F,     g2 As [Single] = 6.6F
Dim h1 As [Double] = 7.7,      h2 As [Double] = -7.7
Dim i1 As [Char] = "A"c,       i2 As [Char] = "A"c
Dim j1 As String = "abc",      j2 As String = "abc"
Dim k1 As DateTime = now,      k2 As DateTime = now
Dim l1 As TimeSpan = tsX,      l2 As TimeSpan = tsX
Dim m1 As Version = versX,     m2 As New Version("2.0")
Dim n1 As Guid = guidX,        n2 As Guid = guidX

' The following types are not CLS-compliant.
' SByte, UInt16, UInt32, UInt64

Console.WriteLine(msg, nl)
Try
' The second and third Show method call parameters are automatically boxed because
' the second and third Show method declaration arguments expect type Object.

Show("Boolean:  ", a1, a2, a1.CompareTo(a2), a1.CompareTo(CObj(a2)))
Show("Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo(CObj(b2)))
Show("Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo(CObj(c2)))
Show("Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo(CObj(d2)))
Show("Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo(CObj(e2)))
Show("Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo(CObj(f2)))
Show("Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo(CObj(g2)))
Show("Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo(CObj(h2)))
Show("Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo(CObj(i2)))
Show("String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo(CObj(j2)))
Show("DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo(CObj(k2)))
Show("TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo(CObj(l2)))
Show("Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo(CObj(m2)))
Show("Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo(CObj(n2)))
'
Console.WriteLine("{0}The following types are not CLS-compliant:", nl)
Console.WriteLine("SByte, UInt16, UInt32, UInt64")

Catch e As Exception
Console.WriteLine(e)
End Try
End Sub 'Main

Public Shared Sub Show(caption As String, var1 As [Object], var2 As [Object], _
resultGeneric As Integer, resultNonGeneric As Integer)
Dim relation As String

Console.Write(caption)
If resultGeneric = resultNonGeneric Then
If resultGeneric < 0 Then
relation = "less than"
ElseIf resultGeneric > 0 Then
relation = "greater than"
Else
relation = "equal to"
End If
Console.WriteLine("{0} is {1} {2}", var1, relation, var2)

' The following condition will never occur because the generic and non-generic
' CompareTo methods are equivalent.

Else
Console.WriteLine("Generic CompareTo = {0}; non-generic CompareTo = {1}", _
resultGeneric, resultNonGeneric)
End If
End Sub 'Show
End Class 'Sample
'
'This example produces the following results:
'
'The following is the result of using the generic and non-generic versions of the
'CompareTo method for several base types:
'
'Boolean:  True is equal to True
'Byte:     1 is equal to 1
'Int16:    -2 is less than 2
'Int32:    3 is equal to 3
'Int64:    4 is greater than -4
'Decimal:  -5.5 is less than 5.5
'Single:   6.6 is equal to 6.6
'Double:   7.7 is greater than -7.7
'Char:     A is equal to A
'String:   abc is equal to abc
'DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
'TimeSpan: 11.22:33:44 is equal to 11.22:33:44
'Version:  1.2.333.4 is less than 2.0
'Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
'aa0057b223
'
'The following types are not CLS-compliant:
'SByte, UInt16, UInt32, UInt64
'
``````

### Remarks

Values must be identical to be considered equal. Particularly when floating-point values depend on multiple mathematical operations, it is common for them to lose precision and for their values to be nearly identical except for their least significant digits. Because of this, the return value of the CompareTo method at times may seem surprising. For example, multiplication by a particular value followed by division by the same value should produce the original value. In the following example, however, the computed value turns out to be greater than the original value. Showing all significant digits of the two values by using the "R" standard numeric format string indicates that the computed value differs from the original value in its least significant digits. For information on handling such comparisons, see the Remarks section of the Equals(Double) method.

``````using System;

public class Example
{
public static void Main()
{
double value1 = 6.185;
double value2 = value1 * .1 / .1;
Console.WriteLine("Comparing {0} and {1}: {2}\n",
value1, value2, value1.CompareTo(value2));
Console.WriteLine("Comparing {0:R} and {1:R}: {2}",
value1, value2, value1.CompareTo(value2));
}
}
// The example displays the following output:
//       Comparing 6.185 and 6.185: -1
//
//       Comparing 6.185 and 6.1850000000000005: -1
``````
``````Module Example
Public Sub Main()
Dim value1 As Double = 6.185
Dim value2 As Double = value1 * .1 / .1
Console.WriteLine("Comparing {0} and {1}: {2}",
value1, value2, value1.CompareTo(value2))
Console.WriteLine()
Console.WriteLine("Comparing {0:R} and {1:R}: {2}",
value1, value2, value1.CompareTo(value2))
End Sub
End Module
' The example displays the following output:
'       Comparing 6.185 and 6.185: -1
'
'       Comparing 6.185 and 6.1850000000000005: -1
``````

This method implements the System.IComparable<T> interface and performs slightly better than the Double.CompareTo method because it does not have to convert the `value` parameter to an object.

Note that, although an object whose value is NaN is not considered equal to another object whose value is NaN (even itself), the IComparable<T> interface requires that `A.CompareTo(A)` return zero.

### Widening Conversions

Depending on your programming language, it might be possible to code a CompareTo method where the parameter type has fewer bits (is narrower) than the instance type. This is possible because some programming languages perform an implicit widening conversion that represents the parameter as a type with as many bits as the instance.

For example, suppose the instance type is Double and the parameter type is Int32. The Microsoft C# compiler generates instructions to represent the value of the parameter as a Double object, then generates a Double.CompareTo(Double) method that compares the values of the instance and the widened representation of the parameter.

Consult your programming language's documentation to determine if its compiler performs implicit widening conversions of numeric types. For more information, see the Type Conversion Tables topic.

### Precision in Comparisons

The precision of floating-point numbers beyond the documented precision is specific to the implementation and version of the .NET Framework. Consequently, a comparison of two particular numbers might change between versions of the .NET Framework because the precision of the numbers' internal representation might change.

## CompareTo(Object)CompareTo(Object)CompareTo(Object)CompareTo(Object)

Compares this instance to a specified object and returns an integer that indicates whether the value of this instance is less than, equal to, or greater than the value of the specified object.

``````public:
virtual int CompareTo(System::Object ^ value);``````
``public int CompareTo (object value);``
``````abstract member CompareTo : obj -> int
override this.CompareTo : obj -> int``````
``Public Function CompareTo (value As Object) As Integer``

#### Parameters

value
Object Object Object Object

An object to compare, or `null`.

#### Returns

A signed number indicating the relative values of this instance and `value`.

Value Description
A negative integer This instance is less than `value`. -or- This instance is not a number (NaN) and `value` is a number.
Zero This instance is equal to `value`. -or- This instance and `value` are both `Double.NaN`, PositiveInfinity, or NegativeInfinity
A positive integer This instance is greater than `value`. -or- This instance is a number and `value` is not a number (NaN). -or- `value` is `null`.

#### Exceptions

`value` is not a Double.

### Examples

The following code example illustrates the use of `CompareTo` in the context of `Double`.

``````obj1 = (Double)450;
if ( a.CompareTo( obj1 ) < 0 )
{
Console::WriteLine( "{0} is less than {1}.", a, obj1 );
}

if ( a.CompareTo( obj1 ) > 0 )
{
Console::WriteLine( "{0} is greater than {1}.", a, obj1 );
}

if ( a.CompareTo( obj1 ) == 0 )
{
Console::WriteLine( "{0} equals {1}.", a, obj1 );
}
``````
``````obj1 = (Double)450;

if (a.CompareTo(obj1) < 0)
Console.WriteLine("{0} is less than {1}.", a.ToString(), obj1.ToString());

if (a.CompareTo(obj1) > 0)
Console.WriteLine("{0} is greater than {1}.", a.ToString(), obj1.ToString());

if (a.CompareTo(obj1) == 0)
Console.WriteLine("{0} equals {1}.", a.ToString(), obj1.ToString());
``````
``````Obj1 = CType(450, Double)

If A.CompareTo(Obj1) < 0 Then
Console.WriteLine(A.ToString() + " is less than " + Obj1.ToString() + ".")
End If

If (A.CompareTo(Obj1) > 0) Then
Console.WriteLine(A.ToString() + " is greater than " + Obj1.ToString() + ".")
End If

If (A.CompareTo(Obj1) = 0) Then
Console.WriteLine(A.ToString() + " equals " + Obj1.ToString() + ".")
End If
``````

### Remarks

The `value` parameter must be `null` or an instance of `Double`; otherwise, an exception is thrown. Any instance of Double, regardless of its value, is considered greater than `null`.

Values must be identical to be considered equal. Particularly when floating-point values depend on multiple mathematical operations, it is common for them to lose precision and for their values to be nearly identical except for their least significant digits. Because of this, the return value of the CompareTo method at times may seem surprising. For example, multiplication by a particular value followed by division by the same value should produce the original value. In the following example, however, the computed value turns out to be greater than the original value. Showing all significant digits of the two values by using the "R" standard numeric format string indicates that the computed value differs from the original value in its least significant digits. For information on handling such comparisons, see the Remarks section of the Equals(Double) method.

``````using System;

public class Example
{
public static void Main()
{
double value1 = 6.185;
object value2 = value1 * .1 / .1;
Console.WriteLine("Comparing {0} and {1}: {2}\n",
value1, value2, value1.CompareTo(value2));
Console.WriteLine("Comparing {0:R} and {1:R}: {2}",
value1, value2, value1.CompareTo(value2));
}
}
// The example displays the following output:
//       Comparing 6.185 and 6.185: -1
//
//       Comparing 6.185 and 6.1850000000000005: -1
``````
``````Module Example
Public Sub Main()
Dim value1 As Double = 6.185
Dim value2 As Object = value1 * .1 / .1
Console.WriteLine("Comparing {0} and {1}: {2}",
value1, value2, value1.CompareTo(value2))
Console.WriteLine()
Console.WriteLine("Comparing {0:R} and {1:R}: {2}",
value1, value2, value1.CompareTo(value2))
End Sub
End Module
' The example displays the following output:
'       Comparing 6.185 and 6.185: -1
'
'       Comparing 6.185 and 6.1850000000000005: -1
``````

This method is implemented to support the IComparable interface. Note that, although a NaN is not considered to be equal to another NaN (even itself), the IComparable interface requires that `A.CompareTo(A)` return zero.

### Precision in Comparisons

The precision of floating-point numbers beyond the documented precision is specific to the implementation and version of the .NET Framework. Consequently, a comparison of two particular numbers might change between versions of the .NET Framework because the precision of the numbers' internal representation might change.