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long keyword in C#

  • Last Updated : 22 Jun, 2020

Keywords are the words in a language that are used for some internal process or represent some predefined actions. long is a keyword that is used to declare a variable which can store a signed integer value from the range of -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. It is an alias of System.Int64.

Syntax:

long variable_name = value;

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

Example:

Input: num: 34638

Output: num: 34638
        Size of a long variable: 8

Input: num = -79349367648374345

Output: Type of num: System.Int64
        num: -79349367648374345
        Size of a long variable: 8

If we input number beyond the range, it shows error-



Integral constant is too large

Example 1:




// C# program for long keyword
using System;
using System.Text;
  
class GFG {
  
    static void Main(string[] args)
    {
        // variable declaration
        long num = 34638;
  
        // to print value
        Console.WriteLine("num: " + num);
  
        // to print size
        Console.WriteLine("Size of a long variable: " + sizeof(long));
    }
}

Output:

num: 34638
Size of a long variable: 8

Example 2:




// C# program for long keyword
using System;
using System.Text;
  
namespace Test {
  
class GFG {
  
    static void Main(string[] args)
    {
        // variable declaration
        long num = -79349367648374345;
  
        // 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 long variable: " + sizeof(long));
  
        // to print 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
        Console.ReadLine();
    }
}
}

Output:

Type of num: System.Int64
num: -79349367648374345
Size of a long variable: 8
Min value of long: -9223372036854775808
Max value of long: 9223372036854775807



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