base--运算符

运算符

Demo01

package operator;

public class Demo01 {
        public static void main(String[] args) {
            //二元运算符
            //Ctrl + D : 复制当前到下一行
            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);

        }
    }

运行结果：

30
-10
200
0.5

Demo02

package operator;

public class Demo02 {
    public static void main(String[] args) {
        long a = 123123123123L;
        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
    }
}

运行结果：

123123123264
141
18

Demo03

package operator;

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

        int a = 10;
        int b = 20;
        int c = 21;

        System.out.println(c%a);//eg: 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);

    }
}

运行结果：

1
false
true
false
true