C# | BitConverter.Int64BitsToDouble() Method

Last Updated : 11 Jul, 2025
BitConverter.Int64BitsToDouble(Int64) Method is used to convert the specified 64-bit signed integer to a double-precision floating point number. Syntax: 
public static double Int64BitsToDouble (long value);
Parameters: This method takes the 64-bit signed integer value as a parameter. Return Value: This method returns a double-precision floating point number whose value is equivalent to value. Below programs illustrate the use of BitConverter.Int64BitsToDouble(Int64) Method: Example 1: CSHARP 
// C# program to demonstrate
// BitConverter.Int64BitsToDouble(Int64)
// Method
using System;

public class GFG {

    // Main Method
    public static void Main()
    {

        // declaring and initializing 
        // double value
        long value = 214748364;

        // Display the double value
        Console.Write("64-bit signed integer: ");
        Console.WriteLine("{0}", value);
        Console.WriteLine();

        // Converting double to long value
        // using BitConverter.DoubleToInt64Bits()
        // Method
        double value1 = BitConverter.Int64BitsToDouble(value);

        // Display the 64-bit signed integer.
        Console.Write("double-precision floating point number: ");
        Console.WriteLine("{0}", value1);
    }
}
Output: 
64-bit signed integer: 214748364

double-precision floating point number: 1.06099789153011E-315
Example 2: CSHARP 
// C# program to demonstrate
// BitConverter.Int64BitsToDouble(Int64)
// Method
using System;
using System.Collections.Generic;

public class GFG {

    // Main Method
    public static void Main()
    {
        // declaring and initializing
        // double value
        long value = 1;

        // Display the double value
        Console.Write("64-bit signed integer: ");
        Console.WriteLine("{0}", value);
        Console.WriteLine();

        // Converting double to long value
        // using BitConverter.DoubleToInt64Bits()
        // Method
        double value1 = BitConverter.Int64BitsToDouble(value);

        // Display the 64-bit signed integer.
        Console.Write("double-precision floating point number: ");
        Console.WriteLine("{0}", value1);
    }
}
Output: 
64-bit signed integer: 1

double-precision floating point number: 4.94065645841247E-324
Reference:
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