C＃| BitConverter.Int64BitsToDouble()方法

BitConverter.Int64BitsToDouble(Int64)方法用于将指定的64位带符号整数转换为双精度浮点数。

句法：

public static double Int64BitsToDouble (long value);

参数：此方法将64位带符号整数值作为参数。

返回值：该方法返回一个双精度浮点数，其值等于value 。

下面的程序说明了BitConverter.Int64BitsToDouble(Int64)方法的用法：

范例1：

// 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);
    }
}

输出：

64-bit signed integer: 214748364

double-precision floating point number: 1.06099789153011E-315

范例2：

// 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);
    }
}

输出：

64-bit signed integer: 1

double-precision floating point number: 4.94065645841247E-324

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.bitconverter.int64bitstodouble?view=netframework-4.7.2