Java 中 doubleToLongBits()方法，带示例

原文:https://www . geesforgeks . org/double-double tolongbits-method-in-Java-with-examples/

java Double 类的Java . lang . Double . Double TolongBits()方法是 Java 中的内置函数，根据 IEEE 754 浮点“双格式”位布局返回指定浮点值的表示。

语法:

public static long doubleToLongBits(double val)

参数:该方法只接受一个指定双精度浮点数的参数值。

返回值:函数返回代表浮点数的位。以下是一些特例:

  • 如果参数为正无穷大，则结果为7ff 000000000000001。
  • 如果参数为负无穷大，则结果为0xfff 00000000000000000000000000000000000000000000000000000000000000000000000
  • 如果参数是 NaN ，结果是0x7ff 800000000000000000000000000000000000000000000000000000000000000000000000

下面的程序说明了Java . lang . double . double tolongbits()方法的使用:

程序 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.doubleToLongBits(val);

        // print
        System.out.println(val + " in long bits: "
                           + answer);
    }
}

输出:

1.5 in long bits: 4609434218613702656

程序二:

// Java program to demonstrate
// Double.doubleToLongBits() 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.doubleToLongBits(val);

        // print
        System.out.println(val + " in long bits: "
                           + answer);

        // function call
        answer = Double.doubleToLongBits(val1);

        // print
        System.out.println(val1 + " in long bits: "
                           + answer);

        // function call
        answer = Double.doubleToLongBits(val2);

        // print
        System.out.println(val2 + " in long bits: "
                           + answer);
    }
}

输出:

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

参考:T2【https://docs . Oracle . com/javase/7/docs/API/Java/lang/double . html # double tolongbits(double)

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