心计％的完成了进度对话框 [英] Calculating percent done for progress dialog

问题描述

我试图用一个进度对话框，显示了多久，直到2时密集的功能就完成了。

在我的第一个功能，我有总数达到DB条目和我已经多少次通过一个做了/ while循环的计数器。当无法完成进度对话框应在50％<​​/ P>

让我做的：

 双总=（计数器/ dbEntries）* 100; //计数器和dbEntries都是廉政局
 

然后我把总由 2 ，因为我想完成一半的数量，因为有2个功能

 双realPercentDone =总/ 2.0;
 

这么说计数器3 和 dbEntries是36 将等于 0.08或8 ％时，乘以100 ，但总的始终是0。我究竟做错了什么？

解决方案

如果柜台和 dbEntries 都是整数那么它很可能在你的第一八佰伴pression括号执行整数除法。 3 DIV 36 = 0 。

试着将其更改为是这样的：

 双总= 100.0 *计数器/ dbEntries;
 

或

 双总=（1.0 *计数器/ dbEntries）* 100.0;
 

请注意：使用 100.0 ，而不是 100 这样的浮点计算都做了

I am trying to use a progress dialog to show how long until 2 time intensive functions are done.

in my first function I have the total number to db entries and a counter for how many times i have gone through a do/while loop. when that gets done the progress dialog should be at 50%

so I do:

double total = (counter/dbEntries)*100; //counter and dbEntries are both int's

then I divide total by 2 because I want half the amount done because there are 2 functions

double realPercentDone = total/2.0;

so say counter is 3 and dbEntries is 36 that would equal 0.08 or 8% when multiplied by 100 but total is always 0. What am I doing wrong?

解决方案

If counter and dbEntries are both integers then it is likely performing integer division in the parenthesis of your first expression. 3 div 36 = 0.

Try changing it to something like this:

double total = 100.0 * counter / dbEntries;

or

double total = (1.0 * counter / dbEntries) * 100.0;

Note: use 100.0 and not 100 so as floating point calculations are done.

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