package operator;
//=====================
//Demo01
//=====================
public class Demo01 {
    public static void main(String[] args) {
        //二元运算符
        //Ctrl + D: 复制当前行到下一行
        int a =10;
        int b =20;
        int c =30;
        int d =40;

        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/(double)b);
    }
}

package operator;
//=====================
//Demo02
//=====================
public class Demo02 {
    public static void main(String[] args) {
        long a = 1231259182931L;
        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
    }
}

package operator;
//=====================
//Demo03
//=====================
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
        int a = 10;
        int b = 20;
        int c = 21;

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

        System.out.println(a>b);
        System.out.println(a<b);
        System.out.println(a==b);
        System.out.println(a!=b);
    }
}