Java .nextDown()

The Math.nextDown() method returns the floating-point value adjacent to the parameter provided in the direction of negative infinity.

Syntax

Math.nextDown(x)

• The x parameter can be of type double or float.
• The return type is of double or float.
• Though it is the opposite of .nextAfter(), the .nextDown() method is semantically equivalent to nextAfter(d, Double.NEGATIVE_INFINITY); or nextAfter(f, Float.NEGATIVE_INFINITY);.

Note: A .nextDown() implementation may run faster than its equivalent .nextAfter() call.

Special cases include the following:

• If x is NaN, the result is NaN.
• If x is negative infinity, the result is negative infinity.
• If x is zero, the result is -Double.MIN_VALUE or -Float.MIN_VALUE.

Example

The following is an example of the .nextDown() method:

// Test.java
public class Test {
  public static void main(String args[]) {
    double d = 23.44;
    System.out.println(Math.nextDown(d));
  }
}

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This results in the following output:

23.439999999999998

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