运算符

运算符

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 = 30;

        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 = 212456882;
        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
        System.out.println(b+d);//int
    }
}

---

package operator;

public class Demo03 {
    public static void main(String[] args) {
        //关系运算返回结果 ： 正确  错误   布尔值
        //if

        int a = 10;
        int b = 20;
        int c = 22;

        //取余  模运算
        System.out.println(c%a);

        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
        int a = 3;

        int b = a++;//执行完这行代码后，先给b赋值，再自增
        //a = a+1;
        System.out.println(a);

        // a = a + 1;
        int c = ++a;//执行完这行代码后,先自增，再给c赋值
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);

        //幂运算 2^3=8
       double pow = Math.pow(2,3);
        System.out.println(pow);
    }
}