长期划分长回报0 [英] Dividing long by long returns 0

问题描述

我正在尝试计算Windows中已用磁盘空间的百分比，而totaldrive表示Long中的C驱动器的总磁盘空间和Long中的freedrive dentoes可用空间。

I am trying to calculate % of used diskspace in Windows and totaldrive denotes total diskspace of c drive in Long and freedrive dentoes free space in Long.

 long totaloccupied = totaldrive - freedrive;

此处计算使用百分比

 Long Percentageused =(totaloccupied/totaldrive*100);
 System.out.println(Percentageused);

print语句返回0.有人可以提供帮助，因为我没有得到所需的值

The print statement returns 0. Can someone help as I am not getting the desired value

推荐答案

你可能将long换成long，指的是（long / long = long）操作，给出一个很长的结果（在你的case 0）。

You are probably dividing a long with a long, which refers to (long/long = long) operation, giving a long result (in your case 0).

你可以通过将除法的操作数强制转换为浮点类型来实现同样的目的。

You can achieve the same thing by casting either operand of the division to a float type.

Long Percentageused = (long)((float)totaloccupied/totaldrive*100);

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