Java - Math ulp(float x) method

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Description

The Java Math ulp(float f) returns the size of an ulp of the argument. An ulp of a float value is the positive distance between this floating-point value and the float 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 Float.MIN_VALUE.

• If the argument is Float.MAX_VALUE, then the result is equal to 2¹⁰⁴.

Declaration

Following is the declaration for java.lang.Math.ulp() method

public static float ulp(float f)

Parameters

f − 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 float value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a float number
      float x = 45.0f;

      // print the radian for this float
      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)=3.8146973E-6

Example 2

The following example shows the usage of Math ulp() method to get a value for a negative float value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a float number
      float x = -45.0f;

      // print the radian for this float
      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)=3.8146973E-6

Example 3

The following example shows the usage of Math ulp() method to get a value of a zero float values.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a float number
      float x = 0.0f;

      // print the radian for this float
      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)=1.4E-45