Java Math.ulp() method

Last Updated : 17 Mar 2025

The java.lang.Math.ulp() returns the size of an ulp of the argument. An ulp is the unit in the last place. An ulp of a float or double value is the positive distance between given value and the next value that is larger in magnitude.

Note: For non-NaN x, ulp(-x) == ulp(x).

Syntax

Parameter

Return

• If the argument is positive or negative double or float value, this method will return the output.
• If the argument is positive or negative Infinity, this method will return positive Infinity.
• If the argument is positive or Negative Zero, this method will return Double.MIN_VALUE.
• If the argument is Double.MAX_VALUE, this method will return the result equal to 2⁹⁷¹.
• If the argument is Float.MAX_VALUE, this method will return the result equal to 2¹⁰⁴.
• If the argument is NaN, this method will return NaN.

Example 1

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Example 2

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Example 3

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Example 4

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Example 5

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Example 6

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