为什么int exp1 = 14/20 * 100;在java中等于'0'？ [英] Why does int exp1 = 14/20*100; equals '0' in java?

问题描述

我正在尝试做一些基本的数学运算，它会一直弹出 0 。我确定它与 int 有关，但我不知道如何解决它。我需要使用整数，但数学到达那些整数使用小数。我该怎么办？

I'm trying to do some basic math and it keeps popping up as 0. I'm sure it has to do with it being an int but I don't know how to work around it. I need to use integers but the math to arrive at those integers uses decimals. How do I do it?

推荐答案

这对黑莓来说并不特别，它是标准的java行为。

This is not special to blackberry, it's standard java behaviour.

这是因为你在做整数数学：

This is because you're doing integer math:

int subexpr1 = 14 / 20; // 0
int subexpr2 =  subexpr1 * 100; // 0

使用双倍代替或更改订单

Use a double instead or change the order

int expr1 = (int) 14.0/20 * 100; // Very small possibility of rounding errors
int expr2 = 14 * 100 / 20; // Will ignore fraction parts

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