C# | BitConverter.DoubleToInt64Bits() Method Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report BitConverter.DoubleToInt64Bits(Double) Method is used to convert the specified double-precision floating point number to a 64-bit signed integer. Syntax: public static long DoubleToInt64Bits (double value); Here, the value is the number which is to be converted. Return Value: This method returns a 64-bit signed integer whose value is equivalent to value. Below programs illustrate the use of BitConverter.DoubleToInt64Bits(Double) Method: Example 1: CSHARP // C# program to demonstrate // BitConverter.DoubleToInt64Bits() // Method using System; public class GFG { // Main Method public static void Main() { // declaring and initializing double value double value = 1.2345678901234565; // Display the double value Console.Write("double-precision floating point: "); Console.WriteLine("{0}", value); Console.WriteLine(); // Converting double to long value // using BitConverter.DoubleToInt64Bits() // Method long value1 = BitConverter.DoubleToInt64Bits(value); // Display the 64-bit signed integer. Console.Write("64-bit signed integer: "); Console.WriteLine("{0}", value1); } } Output: double-precision floating point: 1.23456789012346 64-bit signed integer: 4608238818662570490 Example 2: CSHARP // C# program to demonstrate // BitConverter.DoubleToInt64Bits() // Method using System; class GFG { // Main Method public static void Main() { // declaring and initializing double value double value = 1.0; // Display the double value Console.Write("double-precision floating point: "); Console.WriteLine("{0}", value); Console.WriteLine(); // Converting double to long value // using BitConverter.DoubleToInt64Bits() // Method long value1 = BitConverter.DoubleToInt64Bits(value); // Display the 64-bit signed integer. Console.Write("64-bit signed integer: "); Console.WriteLine("{0}", value1); Console.WriteLine(); // Display the Hexadecimal value Console.Write("Hexadecimal value: "); Console.WriteLine(value1.ToString("X")); } } Output: double-precision floating point: 1 64-bit signed integer: 4607182418800017408 Hexadecimal value: 3FF0000000000000 Reference: https://learn.microsoft.com/en-us/dotnet/api/system.bitconverter.doubletoint64bits?view=netframework-4.7.2 Comment More infoAdvertise with us R rohitprasad3 Follow Improve Article Tags : C# CSharp-method CSharp-BitConverter-Class Similar Reads IntroductionC# TutorialC# (pronounced "C-sharp") is a modern, versatile, object-oriented programming language developed by Microsoft in 2000 that runs on the .NET Framework. 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