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Java - Math ulp(double x) Method
Description
The Java Math ulp(double d) returns the size of an ulp of the argument. An ulp of a double value is the positive distance between this floating-point value and the double value next larger in magnitude. Note that for non-NaN x, ulp(-x) == ulp(x). Special Cases −
If the argument is NaN, then the result is NaN.
If the argument is positive or negative infinity, then the result is positive infinity.
If the argument is positive or negative zero, then the result is Double.MIN_VALUE.
If the argument is Double.MAX_VALUE, then the result is equal to 2971.
Declaration
Following is the declaration for java.lang.Math.ulp() method
public static double ulp(double d)
Parameters
d − the floating-point value whose ulp is to be returned
Return Value
This method returns the size of an ulp of the argument
Exception
NA
Getting ulp from a Positive Double Value Example
The following example shows the usage of Math ulp() method for a positive double value.
package com.tutorialspoint; public class MathDemo { public static void main(String[] args) { // get a double number double x = 45.0; // print the radian for this double System.out.println("Math.ulp(" + x + ")=" + Math.ulp(x)); } }
Output
Let us compile and run the above program, this will produce the following result −
Math.ulp(45.0)=7.105427357601002E-15
Getting ulp from a Negative Double Value Example
The following example shows the usage of Math ulp() method to get a value for a negative double value.
package com.tutorialspoint; public class MathDemo { public static void main(String[] args) { // get a double number double x = -45.0; // print the radian for this double System.out.println("Math.ulp(" + x + ")=" + Math.ulp(x)); } }
Output
Let us compile and run the above program, this will produce the following result −
Math.ulp(-45.0)=7.105427357601002E-15
Getting ulp from a Zero Double Value Example
The following example shows the usage of Math ulp() method to get a value of a zero double values.
package com.tutorialspoint; public class MathDemo { public static void main(String[] args) { // get a double number double x = 0.0; // print the radian for this double System.out.println("Math.ulp(" + x + ")=" + Math.ulp(x)); } }
Output
Let us compile and run the above program, this will produce the following result −
Math.ulp(0.0)=4.9E-324
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