Java Math expm1Méthode d'utilisation et exemple

Java Math mathematical methods

Java Math expm1La méthode () retourne la valeur spécifiée de e, le nombre d'Euler, soustraite de1puissance.

C'est-à-dire, aussi en mathématiques. Math.expm1(4.0) = e^4.0-1Math.expm1(x) = e^x-1

expm1La syntaxe de la méthode () est :

Math.expm1(double a)

NoteThe expm1() is a static method. Therefore, we can call this method directly using the class name Math.

expm1() parameter

• a - as the number to be raised to 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 using 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 ^4.0Values. Here, we can see

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

Java Math mathematical methods