ulong keyword in C#

Keywords are the words in a language that are used for some internal process or represent some predefined actions. ulong is a keyword that is used to declare a variable which can store an unsigned integer value from the range 0 to 18,446,744,073,709,551,615. It is an alias of System.UInt64. ulong keyword occupies 8 bytes (64 bits) space in the memory. Syntax:

ulong variable_name = value;

Example:

Input: num: 223

Output: num: 223
        Size of a ulong variable: 8

Input: num = 0

Output: Type of num: System.UInt64
        num: 0
        Size of a ulong variable: 8

Note:

If we input number beyond the range, it shows error-
```
Integral constant is too large
```

If we input wrong value for eg. -34, it shows error-

Constant value `-34' cannot be converted to a `ulong'

Example 1:

csharp

// C# program for ulong keyword
using System;
using System.Text;

class Prog {

    static void Main(string[] args)
    {
        // variable declaration
        ulong num = 223;

        // to print value
        Console.WriteLine("num: " + num);

        // to print size
        Console.WriteLine("Size of a ulong variable: " + sizeof(ulong));
    }
}

Output:

num: 223
Size of a ulong variable: 8

Example 2:

csharp

// C# program for ulong keyword
using System;
using System.Text;

namespace Test {

class Prog {

    static void Main(string[] args)
    {
        // variable declaration
        ulong num = 0;

        // to print type of variable
        Console.WriteLine("Type of num: " + num.GetType());

        // to print value
        Console.WriteLine("num: " + num);

        // to print size
        Console.WriteLine("Size of a ulong variable: " + sizeof(ulong));

        // to print minimum & maximum value of ulong
        Console.WriteLine("Min value of ulong: " + ulong.MinValue);
        Console.WriteLine("Max value of ulong: " + ulong.MaxValue);

        // hit ENTER to exit
        Console.ReadLine();
    }
}
}

Output:

Type of num: System.UInt64
num: 0
Size of a ulong variable: 8
Min value of ulong: 0
Max value of ulong: 18446744073709551615

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