Java Math expm1Verwendung und Beispiel der ()

Java Math Mathematical Methods

Java Math expm1Die ()-Methode gibt den angegebenen Wert der Euler-Zahl e ab.1Die Potenz.

Das bedeutet, auch in der Mathematik. Math.expm1(4.0) = e^4.0-1Math.expm1(x) = e^x-1

expm1Die Syntax der ()-Methode lautet:

Math.expm1(double a)

Note: The expm1() is a static method. Therefore, we can use the class name Math to directly call this method.

expm1() parameter

• a - to be used as the power of e

expm1() return value

• returns the parameter a'se ^a-1

NoteHere, e is Euler's number, whose value is2.71828

Example: Java Math.expm1()

class Main {
　　public static void main(String[] args) {
　　　　//　Math.expm1() method
　　　　double a =　4.0d;
　　　　System.out.println(Math.expm1(a));　　//　53.598150033144236
　　　　//without Math.expm1()
　　　　//the value of Euler's number
　　　　double euler =　2.71828d;
　　　　System.out.println(Math.pow(euler, a)-1);　　//　53.5980031309658
　　}
}

In the above example, we usedMath.pow()methods to calculatee ^4.0Value. Here, we can see

Math.expm1(4.0) = e4.0-1

Java Math Mathematical Methods