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C# UInt64 Struct - GeeksforGeeks

C# UInt64 Struct

Last Updated : 11 Jul, 2025

In C#, the UInt64 struct represents a 64-bit unsigned integer, commonly referred to as the ulong data type. It is defined in the System namespace and provides various methods for mathematical computations, parsing, and type conversion. Since it is an unsigned type, it only holds non-negative values.

Range: UInt64 ranges from 0 to 18,446,744,073,709,551,615.
Bitwise Operations: It supports bitwise operations like AND (&), OR (|), XOR (^), NOT (~), and shifts (<<, >>).
Convert and Math Class Compatibility: It works with methods from the Convert and Math classes for operations like rounding, absolute value, and power calculations.

Fields Field Description MaxValue Represents the largest possible value of UInt64. This field is constant. MinValue Represents the smallest possible value of UInt64. This field is constant.

Example: Working with UInt64 Fields


 // C# program to illustrate the 
// fields of UInt64 struct
using System;

class Geeks
{
    static public void Main() 
    {
        // Unsigned 64-bit integer 
        ulong val = 18446744073709551615;

        // Checking the unsigned integer 
        if (val.Equals(UInt64.MinValue))  
        { 
            Console.WriteLine("Equal to MinValue"); 
        } 
        else if (val.Equals(UInt64.MaxValue))  
        { 
            Console.WriteLine("Equal to MaxValue"); 
        } 
        else 
        { 
            Console.WriteLine("Not Equal"); 
        } 
    }
}

Methods Methods Description CompareTo() Compares the current instance to a specified object or UInt64 and returns an indication of their relative values. Equals() Returns a value which shows whether the current instance is equal to a specified object or UInt64. GetHashCode() Returns the hash code for the current instance. GetTypeCode() Returns the TypeCode for value type UInt64. Parse() Converts the string representation of a number to its 64-bit unsigned integer equivalent. ToString() Converts the numeric value of the current instance to its equivalent string representation. TryParse() Tries to convert the string representation of a number to its 64-bit unsigned integer equivalent. A return value indicates whether the conversion succeeded or failed.

Example: Using GetHashCode() Method


 // C# program to demonstrate how to get the 
// hash code of the 64-bit Unsigned integer
using System;

class Geeks
{
    static public void Main() 
    {
        // UInt64 variable 
        ulong val = 3654121225155;

        // Get the hash code using GetHashCode Method
        int res = val.GetHashCode();

        Console.WriteLine("The hash code of val is: {0}", res); 
    } 
}

Output

The hash code of val is: -895944559

Important Points:

UInt64 is a 64-bit unsigned integer, which means it can only store non-negative numbers.
It provides a variety of methods to handle comparisons, parsing, and hashing.
Common fields include MaxValue (the largest value it can store) and MinValue (the smallest value, which is 0).
Useful methods like CompareTo(), Equals(), ToString(), and TryParse() help in comparing and converting UInt64 values.

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