Java.lang.Math.nextAfter() Method

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Description

The java.lang.Math.nextAfter(double start, double direction) returns the floating-point number adjacent to the first argument in the direction of the second argument. If both arguments compare as equal the second argument is returned. Special cases:

  • If either argument is a NaN, then NaN is returned.

  • If both arguments are signed zeros, direction is returned unchanged (as implied by the requirement of returning the second argument if the arguments compare as equal).

  • If start is ±Double.MIN_VALUE and direction has a value such that the result should have a smaller magnitude, then a zero with the same sign as start is returned.

  • If start is infinite and direction has a value such that the result should have a smaller magnitude, Double.MAX_VALUE with the same sign as start is returned.

  • If startis equal to ± Double.MAX_VALUE and direction has a value such that the result should have a larger magnitude, an infinity with same sign as start is returned.

Declaration

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

public static double nextAfter(double start, double direction)

Parameters

  • start -- starting floating-point value

  • direction -- value indicating which of start's neighbors or start should be returned

Return Value

This method returns the floating-point number adjacent to start in the direction of direction.

Exception

  • NA

Example

The following example shows the usage of lang.Math.nextAfter() method.

package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get two double numbers
      double x = 98759.765;
      double y = 154.28764;

      // print the next number for x towards y
      System.out.println("Math.nextAfter(" + x + "," + y + ")="
              + Math.nextAfter(x, y));

      // print the next number for y towards x
      System.out.println("Math.nextAfter(" + y + "," + x + ")="
              + Math.nextAfter(y, x));

   }
}

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

Math.nextAfter(98759.765, 4.28764)=98759.76499999998
Math.nextAfter(4.28764, 98759.765)=154.28764000000004



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