Double doubleToLongBits() method in Java with examples (original) (raw)

Last Updated : 11 Jul, 2025

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);
}

}

`