That is, if the argument is 6.7, then the adjacent number of 6.7 in direction of negative infinity is 6.699999999999999.
The syntax of the nextDown() method is:
Math.nextDown(start)
Note: The nextDown() method is a static method. Hence, we can call the method directly using the class name Math.
nextDown() Parameters
- start - starting number whose adjacent number is to be returned
Note: The data type of start can be either float or double.
nextDown() Return Values
- returns the number adjacent to start towards negative infinity
- returns NaN if start is NaN
- returns negative infinity if start is negative infinity
Note: The nextDown() method is equivalent to the Math.nextAfter(start, Double.Negative_INFINITY).
Example: Java Math.nextDown()
class Main {
public static void main(String[] args) {
// float arguments
float start1 = 7.9f;
System.out.println(Math.nextDown(start1)); // 7.8999996
// double arguments
double start2 = 7.9;
System.out.println(Math.nextDown(start2)); // 7.8999999999999995
// with positive infinity
double infinity = Double.NEGATIVE_INFINITY;
System.out.println(Math.nextDown(infinity)); // -Infinity
// with NaN
double nan = Math.sqrt(-5);
System.out.println(Math.nextDown(nan)); // NaN
}
}
Here, we have used the Java Math.sqrt(-5) method to calculate the square root of -5. Since, the square root of negative number is not a number, Math.nextDown(nan) returns NaN.
The Double.NEGATIVE_INFINITY is a field of Double class that allows us to implement infinity in a program.
