English 中文(简体)
Math.ceil Back 0.0?
原标题:Math.ceil returning 0.0?
  • 时间:2012-04-21 13:07:38
  •  标签:
  • java
  • math

• 从事 Java项目工作的Im。

double totalPages;
int amountKits = 2;
totalPages = amountKits / 3;
System.out.println("Total pages before ceil: " + totalPages);
totalPages = Math.ceil(totalPages);
System.out.println("Amount of Kits: " + amountKits);
System.out.println("Total Pages: " + totalPages);

结果是:

Total pages before ceil: 0.0
Amount of Kits: 2
Total Pages: 0.0

Does anyone know why this is happening? (Sorry, I m a noob, I know)

问题回答

由于您重新计算了<代码>2 / 3 integer arithmetic。

Try:

totalPages = amountKits / 3.0;

instead.

integer Division 0. 之后,该数值换算为浮动点值,在您指定<代码>时,为0.0。

You need to perform floating point division, for example by writing amountKits/3.0.





相关问题
Spring Properties File

Hi have this j2ee web application developed using spring framework. I have a problem with rendering mnessages in nihongo characters from the properties file. I tried converting the file to ascii using ...

Logging a global ID in multiple components

I have a system which contains multiple applications connected together using JMS and Spring Integration. Messages get sent along a chain of applications. [App A] -> [App B] -> [App C] We set a ...

Java Library Size

If I m given two Java Libraries in Jar format, 1 having no bells and whistles, and the other having lots of them that will mostly go unused.... my question is: How will the larger, mostly unused ...

How to get the Array Class for a given Class in Java?

I have a Class variable that holds a certain type and I need to get a variable that holds the corresponding array class. The best I could come up with is this: Class arrayOfFooClass = java.lang....

SQLite , Derby vs file system

I m working on a Java desktop application that reads and writes from/to different files. I think a better solution would be to replace the file system by a SQLite database. How hard is it to migrate ...

热门标签