C# long Keyword with Example

In this tutorial, we will learn about the long keyword in C# (with Example), what is long keyword, how to use it in C#? By IncludeHelp Last updated : April 04, 2023

C# long Keyword

In C#, long is a keyword which is used to declare a variable that can store a signed integer value between the range of -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. long keyword is an alias of System.Int64.

It occupies 8 bytes (64 bits) space in the memory.


long variable_name = value;

Example of long keyword in C#

Here, we are declaring a long variable num, initializing it with the value 12345 and printing its value, type and size of a long type variable.

using System;
using System.Text;

namespace Test {
  class Program {
    static void Main(string[] args) {
      //variable declaration
      long num = 12345;

      //printing value
      Console.WriteLine("num: " + num);
      //printing type of variable
      Console.WriteLine("Type of num: " + num.GetType());
      //printing size
      Console.WriteLine("Size of a long variable: " + sizeof(long));
      //printing minimum & maximum value of long
      Console.WriteLine("Min value of long: " + long.MinValue);
      Console.WriteLine("Max value of long: " + long.MaxValue);

      //hit ENTER to exit


num: 12345
Type of num: System.Int64
Size of a long variable: 8
Min value of long: -9223372036854775808
Max value of long: 9223372036854775807

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