Java - Math nextUp(double x) method

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Description

The Java Math nextUp(double d) returns the floating-point value adjacent to d in the direction of positive infinity. This method is semantically equivalent to nextAfter(d, Double.POSITIVE_INFINITY); however, a nextUp implementation may run faster than its equivalent nextAfter call. Special cases −

• If the argument is NaN, the result is NaN.

• If the argument is positive infinity, the result is positive infinity.

• If the argument is zero, the result is Double.MIN_VALUE

Declaration

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

public static double nextUp(double d)

Parameters

d − starting floating-point value

Return Value

This method returns the adjacent floating-point value closer to positive infinity.

Exception

NA

Example 1

The following example shows the usage of Math nextUp() method for a positive value.

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

      // get a number
      double x = 154.28764;
   
      // print the next number for x
      System.out.println("Math.nextUp(" + x + ")="
         + Math.nextUp(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.nextUp(154.28764)=154.28764000000004

Example 2

The following example shows the usage of Math nextUp() method for a zero value.

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

      // get a number
      double x = 0.0;
   
      // print the next number for x
      System.out.println("Math.nextUp(" + x + ")="
         + Math.nextUp(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.nextUp(0.0)=4.9E-324

Example 3

The following example shows the usage of Math nextUp() method for negative value.

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

      // get a number
      double x = -154.28764;
   
      // print the next number for x
      System.out.println("Math.nextUp(" + x + ")="
         + Math.nextUp(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.nextUp(-154.28764)=-154.28763999999998