Java Double doubleToRawLongBits()用法及代碼示例

Java Double類的doubleToRawLongBits()方法是Java中的內置函數，該函數根據保留Not-a-Number(NaN)值的IEEE 754浮點“double format”位布局返回指定浮點值的表示形式。

用法:

public static long doubleToRawLongBits(double val)

參數：該方法僅接受一個參數val，該參數指定雙精度浮點數。

返回值：該函數返回代表浮點數的位。以下是特殊情況：

如果參數為正無窮大，則結果為7ff0000000000000L。
如果參數為負無窮大，則結果為0xfff0000000000000L。
如果參數為NaN，則結果為0x7ff8000000000000L。

以下程序說明了Double.doubleToRawLongBits()方法的使用：

示例1:

// Java program to demonstrate 
// Double.doubleToLongBits() method 
  
import java.lang.*; 
  
class Gfg1 { 
  
    public static void main(String args[]) 
    { 
  
        double val = 1.5d; 
  
        // function call 
        long answer = Double.doubleToRawLongBits(val); 
  
        // print 
        System.out.println(val + " in raw long bits: "
                           + answer); 
    } 
}

輸出：

1.5 in raw long bits: 4609434218613702656

示例2:

// Java program to demonstrate 
// Double.doubleToRawLongBits() method 
  
import java.lang.*; 
  
class Gfg1 { 
  
    public static void main(String args[]) 
    { 
  
        double val = Double.POSITIVE_INFINITY; 
        double val1 = Double.NEGATIVE_INFINITY; 
        double val2 = Double.NaN; 
  
        // function call 
        long answer = Double.doubleToRawLongBits(val); 
  
        // print 
        System.out.println(val + " in raw long bits: "
                           + answer); 
  
        // function call 
        answer = Double.doubleToRawLongBits(val1); 
  
        // print 
        System.out.println(val1 + " in raw long bits: "
                           + answer); 
  
        // function call 
        answer = Double.doubleToRawLongBits(val2); 
  
        // print 
        System.out.println(val2 + " in raw long bits: "
                           + answer); 
    } 
}

輸出：

Infinity in raw long bits: 9218868437227405312
-Infinity in raw long bits: -4503599627370496
NaN in raw long bits: 9221120237041090560

參考： https://docs.oracle.com/javase/7/docs/api/java/lang/Double.html#doubleToRawLongBits(double)

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注：本文由純淨天空篩選整理自gopaldave大神的英文原創作品 Double doubleToRawLongBits() method in Java with examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。