Difference between Int64 and UInt64 in C# Last Updated : 26 May, 2020 Summarize Comments Improve Suggest changes Share Like Article Like Report 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; Comment More infoAdvertise with us S SHUBHAMSINGH10 Follow Improve Article Tags : Difference Between C# CSharp-Int64-Struct CSharp-UInt64-Struct Similar Reads Difference Between IPv4 and IPv6 IPv4 and IPv6 are two versions of the system that gives devices a unique address on the internet, known as the Internet Protocol (IP). IP is like a set of rules that helps devices send and receive data online. Since the internet is made up of billions of connected devices, each one needs its own spe 7 min read Differences between TCP and UDP Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) both are protocols of the Transport Layer Protocols. 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