Java笔记-基本运算符

a++与++a的区别:

```java
public class test {

    public static void main(String[] args) {
        int a= 3;
        int b = a++;
        System.out.println(b);  //a先赋值给b  再自增 b值为3
        System.out.println(a); //a值为4

    }
}

public class test {

    public static void main(String[] args) {
        int a= 3;
        int b = ++a;
        System.out.println(b);  //a先自增 再赋值给b b值为4
        System.out.println(a); //a值为4

    }
}

幂运算

public class test {

    public static void main(String[] args) {
        double a= 2;
        double b = 3;
        double pow = Math.pow(a,b);

        System.out.println(pow);

    }
}