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

Example 1

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

Example 2

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

Example 3

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
java_lang_math.htm
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