BigInteger.Equals Method (UInt64)

Returns a value that indicates whether the current instance and an unsigned 64-bit integer have the same value.

This API is not CLS-compliant. 

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

public bool Equals(
	ulong other


Type: System.UInt64
The unsigned 64-bit integer to compare.

Return Value

Type: System.Boolean
true if the current instance and the unsigned 64-bit integer have the same value; otherwise, false.

To determine the relationship between the two objects instead of just testing for equality, call the BigInteger.CompareTo(UInt64) method.

The following example compares the approximate distance of several stars from Earth with the distance of Epsilon Indi from Earth to determine whether they are equal. The example uses each overload of the Equals method to test for equality.

const long LIGHT_YEAR = 5878625373183;

BigInteger altairDistance = 17 * LIGHT_YEAR;
BigInteger epsilonIndiDistance = 12 * LIGHT_YEAR;
BigInteger ursaeMajoris47Distance = 46 * LIGHT_YEAR;
long tauCetiDistance = 12 * LIGHT_YEAR;
ulong procyon2Distance = 12 * LIGHT_YEAR;
object wolf424ABDistance = 14 * LIGHT_YEAR;

outputBlock.Text += "Approx. equal distances from Epsilon Indi to:" + "\n";
outputBlock.Text += String.Format("   Altair: {0}",
                  epsilonIndiDistance.Equals(altairDistance)) + "\n";
outputBlock.Text += String.Format("   Ursae Majoris 47: {0}",
                  epsilonIndiDistance.Equals(ursaeMajoris47Distance)) + "\n";
outputBlock.Text += String.Format("   TauCeti: {0}",
                  epsilonIndiDistance.Equals(tauCetiDistance)) + "\n";
outputBlock.Text += String.Format("   Procyon 2: {0}",
                  epsilonIndiDistance.Equals(procyon2Distance)) + "\n";
outputBlock.Text += String.Format("   Wolf 424 AB: {0}",
                  epsilonIndiDistance.Equals(wolf424ABDistance)) + "\n";
// The example displays the following output:
//    Approx. equal distances from Epsilon Indi to:
//       Altair: False
//       Ursae Majoris 47: False
//       TauCeti: True
//       Procyon 2: True
//       Wolf 424 AB: False      


Supported in: 5, 4

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