Double doubleToLongBits() method in Java with examples

Last Updated : 26 Oct, 2018

The java.lang.Double.doubleToLongBits() method of Java Double class is a built-in function in java that returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout. Syntax:

  public static long doubleToLongBits(double val)

Parameter: The method accepts only one parameter val which specifies a double precision floating-point number. Return Values: The function returns the bits that represent the floating-point number. Below are the special cases:

If the argument is positive infinity, the result is 7ff0000000000000L.
If the argument is negative infinity, the result is 0xfff0000000000000L.
If the argument is NaN, the result is 0x7ff8000000000000L.

Below programs illustrates the use of java.lang.Double.doubleToLongBits() method: Program 1:

java

// 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);     } }

Output:

  1.5 in long bits: 4609434218613702656

Program 2:

Java

// 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);     } }

Output:

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

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

Double doubleToLongBits() method in Java with examples

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Double doubleToLongBits() method in Java with examples

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