java math.round
时间: 2023-08-23 11:08:13 浏览: 53
The `Math.round()` method in Java rounds a given decimal number to the nearest integer. If the decimal is exactly halfway between two integers, it will round to the nearest even integer.
Syntax:
```
public static long round(double num)
```
Example:
```java
double num1 = 2.6;
double num2 = 2.4;
long rounded1 = Math.round(num1);
long rounded2 = Math.round(num2);
System.out.println(rounded1); // Output: 3
System.out.println(rounded2); // Output: 2
```
In the example above, `num1` is closer to 3 than to 2, so `Math.round(num1)` returns 3. `num2` is closer to 2 than to 3, so `Math.round(num2)` returns 2.
相关问题
java Math.round
Java中的Math.round()方法是将浮点型进行“四舍五入”转换为int类型的一个方法(不含小数点.0)。它的使用方式是直接调用Math类的round()方法,并传入需要进行四舍五入的浮点数作为参数。该方法会返回一个整数值,表示四舍五入后的结果。例如,Math.round(10.5)的结果是11,Math.round(10.4)的结果是10。需要注意的是,Math.round()方法的四舍五入方式与保留小数位数的四舍五入方式有所不同。\[2\]\[3\]
#### 引用[.reference_title]
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java math.round保留小数
在Java中,有几种方法可以用于保留小数点后两位。其中一种常用的方法是使用Math.round函数。通过将要保留小数位数的数值乘以100,然后使用Math.round函数进行四舍五入,再将结果除以100,即可得到保留两位小数的数值。
具体代码如下:
```
double num = Math.round(5.2544555 * 100) * 0.01;
System.out.println(num);
```
这段代码会将5.2544555保留两位小数后输出为5.25。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [java 常用四舍五入保留小数点后两位方法](https://blog.csdn.net/qq_38463737/article/details/121294156)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* *3* [[Java]保留数值后2位的几种方法](https://blog.csdn.net/u010188178/article/details/98091515)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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