-
Notifications
You must be signed in to change notification settings - Fork 87
Expand file tree
/
Copy pathArithmeticOperator.java
More file actions
43 lines (38 loc) · 1.15 KB
/
Copy pathArithmeticOperator.java
File metadata and controls
43 lines (38 loc) · 1.15 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
/**
* 演示算术运算符的使用
*/
public class ArithmeticOperator {
//编写一个main方法
public static void main(String[] args) {
// /使用
System.out.println(10 / 4); //从数学来看是2.5, java中 2
System.out.println(10.0 / 4); //java是2.5
// 注释快捷键 ctrl + /, 再次输入 ctrl + / 取消注释
double d = 10 / 4;//java中10 / 4 = 2, 2=>2.0
System.out.println(d);// 是2.0
// % 取模 ,取余
// 在 % 的本质 看一个公式!!!! a % b = a - a / b * b
// -10 % 3 => -10 - (-10) / 3 * 3 = -10 + 9 = -1
// 10 % -3 = 10 - 10 / (-3) * (-3) = 10 - 9 = 1
// -10 % -3 = (-10) - (-10) / (-3) * (-3) = -10 + 9 = -1
System.out.println(10 % 3); //1
System.out.println(-10 % 3); // -1
System.out.println(10 % -3); //1
System.out.println(-10 % -3);//-1
//++的使用
//
int i = 10;
i++;//自增 等价于 i = i + 1; => i = 11
++i;//自增 等价于 i = i + 1; => i = 12
System.out.println("i=" + i);//12
/*
作为表达式使用
前++：++i先自增后赋值
后++：i++先赋值后自增
*/
int j = 8;
//int k = ++j; //等价 j=j+1;k=j;
int k = j++; // 等价 k =j;j=j+1;
System.out.println("k=" + k + "j=" + j);//8 9
}
}