Difference between Int64 and UInt64 in C#

Last Updated : 26 May, 2020

Int64: This Struct is used to represents 64-bit signed integer. The Int64 can store both types of values including negative and positive between the ranges of -9,223,372,036,854,775,808 to +9, 223,372,036,854,775,807

Example :

C#

// C# program to show the 
// difference between Int64 
// and UInt64 
  
using System; 
using System.Text; 
  
public
class GFG { 
  
  // Main Method 
  static void Main(string[] args) { 
  
    // printing minimum & maximum values 
    Console.WriteLine("Minimum value of Int64: " 
                      + Int64.MinValue); 
    Console.WriteLine("Maximum value of Int64: " 
                      + Int64.MaxValue); 
    Console.WriteLine(); 
  
    // Int64 array 
    Int64[] arr1 = {-3, 0, 1, 3, 7}; 
  
    foreach (Int64 i in arr1) 
    {  
      Console.WriteLine(i); 
    } 
  } 
}

Output:

Minimum value of Int64: -9223372036854775808
Maximum value of Int64: 9223372036854775807

-3
0
1
3
7

UInt64: This Struct is used to represents 64-bit unsigned integer. The UInt64 can store only positive value only which ranges from 0 to 18,446,744,073,709,551,615.

Example :

C#

// C# program to show the  
// difference between Int64  
// and UInt64 
  
using System; 
using System.Text; 
  
public class GFG{ 
      
    // Main Method 
    static void Main(string[] args) 
    { 
  
        //printing minimum & maximum values 
        Console.WriteLine("Minimum value of UInt64: "
                          + UInt64.MinValue); 
        Console.WriteLine("Maximum value of UInt64: "
                          + UInt64.MaxValue); 
        Console.WriteLine(); 
          
        //Int64 array 
        UInt64[] arr1 = { 13, 0, 1, 3, 7}; 
          
        foreach (UInt64 i in arr1) 
        { 
            Console.WriteLine(i); 
        } 
    } 
}

Output:

Minimum value of UInt64: 0
Maximum value of UInt64: 18446744073709551615

13
0
1
3
7

Differences between Int64 and UInt64 in C#

Sr.No	INT64	UINT64
1.	Int64 is used to represents 64-bit signed integers .	UInt64 is used to represent 64-bit unsigned integers.
2.	Int64 stands for signed integer.	UInt64 stands for unsigned integer.
3.	It can store negative and positive integers.	It can store only positive integers.
4.	It takes 8-bytes space in the memory.	It also takes 8-bytes space in the memory.
5.	The range of Int64 is from -9223372036854775808 to +9223372036854775807.	The UInt64 ranges from 0 to 18446744073709551615.
6.	Syntax to declare the Int64 : Int64 variable_name;	Syntax to declare the UInt64: UInt64 variable_name;

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