运算符

package operator;

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;

public class Demo02 {

    public static void main(String[] args) {
        long a = 12345678945213562L;
        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;

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;


        System.out.println(c%a);// c / a      21  / 10 = 2........1
        //取余，模运算


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