package operator;

public class Demo01 {
    public static void main(String[] args) {
        // 二元运算符
        int a = 10;
        int b = 20;
        int c = 25;
        int d = 25;
        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/(double)b);

    }
}

package operator;

public class Demo02 {
    public static void main(String[] args) {
        long a =1212321312321312L;
        int b =123;
        short c =10;
        byte d = 8;

        System.out.println(a+b+c+d); //long
        System.out.println(b+c+d);  //Int
        System.out.println(c+d);  //Int   cast 转换的意思  operator 运算符
    }
}

package operator;

public class Demo03 {
    //关系运算符返回的结果: 正确, 错误 布尔值
    public static void main(String[] args) {

        int a =10;
        int b =20;

        int c =21;

        //取余; 模运算
        System.out.println(c%a); //c /a 21/10 =2 ....1
        System.out.println(a>b);
        System.out.println(a<b);
        System.out.println(a==b);
        System.out.println(a!=b);
    }

}

package operator;

public class Demo04 {
    public static void main(String[] args) {
        // ++ -- 自增,自减 一元运算符
        int a =3;
        int b =a++; //执行完这行代码前,先给b赋值=3,再自增a = a+1

        System.out.println(a); // 4
        // a++ a=a+1;

        int c =++a; //++a a=a+1; 执行完这行代码前,先自增,再给b赋值

        System.out.println(a);
        System.out.println(a);
        System.out.println(b);
        System.out.println(b);
        System.out.println(c);
        System.out.println(c);
        // 幂运算 2^3 2*2*2 = 8 很多运算, 我们会使用一些工具类来操作!
        double pow = Math.pow(2,3);
        System.out.println(pow);

    }

}