基本运算符 

 1 package operation;
 2 
 3 public class Demo1 {
 4     public static void main(String[] args) {
 5         //二元运算符
 6         //Ctrl+D :复制当前行到下一行
 7         int a=10;
 8         int b=20;
 9         int c=30;
10         int d=40;
11 
12         System.out.println(a+b);
13         System.out.println(a-b);
14         System.out.println(a*b);
15         System.out.println(a/(double)b);
16     }
17 }
 1 package operation;
 2 
 3 public class Demo2 {
 4     public static void main(String[] args) {
 5 
 6 //       运算结果按照类型的优先级
 7 //      类型转换：byte、short、char用运算符运算后自动转型为int类型
 8         long a =123123123123L;
 9         int b =123;
10         short c =10;
11         byte d =8;
12 
13         System.out.println(a+b+c+d);//long
14         System.out.println(b+c+d);//int
15         System.out.println(c+d);//int
16 
17         //关系运算符f返回的结果：正确，错误  布尔值
18 
19         int a2 = 10;
20         int b2 = 20;
21         int c2 = 22;
22         //取余，模运算
23         System.out.println(c2%a2);
24 
25         System.out.println(a2>b2);
26         System.out.println(a2<b2);
27         System.out.println(a2==b2);
28         System.out.println(a2!=b2);
29 
30 
31     }
32 }

 

posted @ 2021-02-03 21:44  奔啵儿灞  阅读(62)  评论(0)    收藏  举报