blocks|key|604465|text|这是一个整数除法的例子。尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|604466|private+float+frequency+=+1.0/2.0;|code-block|syntax|javascript|604467|Java将执行1/2，其结果为0.5。然而，由于Java认为这是对整数的操作(而0.5不是整数)，所以它将截断小数，只留下整数部分0。通过告诉Java使用浮点数(1.0与1)，您告诉它保留中间计算的小数部分。|604468|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is an example of integer division. Try:

<pre><code>private float frequency = 1.0/2.0;
</code></pre>

Java will execute 1/2, which yields 0.5. However, since Java sees this as operations on integers (and 0.5 isn't an integer), it'll truncate the decimal and leave just the integer part, 0. By telling Java to work with floats (1.0 vs. 1), you tell it to keep the decimal part of the intermediate computation.

blocks|key|1353901|text|1和2在java中是整数。如果你想让它们被显式地解释为浮点数，你需要这样做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1353902|private+float+frequency+=+1f/2f;|code-block|syntax|javascript|1353903|如果你不关心这个数学运算是不是真的先做了double，那么这段代码就更容易读懂了：|1353904|private+float+frequency+=+1.0/2.0;|1353905|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

1 and 2 are integers in java. If you want them to be explicitly interpreted as floats you need to do.

<pre><code>private float frequency = 1f/2f;
</code></pre>

If you don't care if the math is actually done on a double first, then just this is easier to read:

<pre><code>private float frequency = 1.0/2.0;
</code></pre>

blocks|key|2373607|text|这是整数除法(仅限整数)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2373608|尝试：|2373609|private+float+frequency+=+1/2.0;|code-block|syntax|javascript|2373610|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is integer division (only whole numbers).

Try:

<pre><code>private float frequency = 1/2.0;
</code></pre>

blocks|key|2243031|text|1和2是整数，它们返回一个整数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2243032|在做除法之前，尝试用这些值创建两个浮点数。|2243033|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

the 1 and 2 are integers, and they return an integer.

Try creating two floats with those values before doing the division.

blocks|key|2243132|text|你需要对进行转换。这是|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2243133|float+myValue+=+(float)+1/2;|CODE|2243134|class+Main+{
++++public+static+void+main(String[]+args)+{
++++++++float+myValue+=+(float)+1/2;
++++++++System.out.println("1/2+=+"+%2B+myValue);
++++}
}|code-block|syntax|javascript|2243135|输出将是1/2+=+0.5|2243136|entityMap^0|6|5|0|0|S|0|S|0|0|0|D|4|9|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|Z|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|H]]|D|@]|E|$]]|$1|P|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|Q|$]]

You need to cast. Here is <a href="http://www.java-samples.com/showtutorial.php?tutorialid=1170" rel="nofollow">more information</a>

<code>float myValue = (float) 1/2;</code>

<pre><code>class Main {
 public static void main(String[] args) {
 float myValue = (float) 1/2;
 System.out.println("1/2 = " + myValue);
 }
}
</code></pre>

Output would be <code>1/2 = 0.5</code>

blocks|key|1355646|text|当你对整数进行算术运算时，resul会变成一个整数，还会加上.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1355647|所以|1355648|private+float+frequency+=+1.0/2.0;|code-block|syntax|javascript|1355649|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

When you do aritmetic with integers the resul becomes an integer also add .0

so

<pre><code>private float frequency = 1.0/2.0;
</code></pre>

blocks|key|2243099|text|使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2243100|++++private+float+frequency+=+1F/2F;|code-block|syntax|javascript|2243101|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use

<pre><code> private float frequency = 1F/2F;
</code></pre>

blocks|key|1353984|text|如果您将两个整数相除，并且没有得到正确的输出，那么只需将计算后的int结果转换为float，如下所示。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1353985|++++int+b+=+2;
++++int+a+=+1;

++++float+out+=+(float)+a+/+b;
++++System.out.println(out);|code-block|syntax|javascript|1353986|这将产生输出0.5|1353987|entityMap^0|W|3|14|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

If you are dividing two integers and you are not getting the correct output just caste the evaluated <code>int</code> result to <code>float</code> as shown below.

<pre><code> int b = 2;
 int a = 1;

 float out = (float) a / b;
 System.out.println(out);
</code></pre>

This will produce the output 0.5

I have been trying to use my new IOIO for android, and needed to find a frequency of a signal. 
So I converted the signal to binary and then did 1 divided by the time between 1's. Although when I did this I found that I got 0 as my output. I then decided to see what 1 / 2 gave me, and to my surprise it also gave 0! Anyone have any idea why this is the case?

Code:
 <code>private float frequency = 1/2;</code> 

Could this be todo with using <code>Float.toString(frequency)</code>?

Android - 1 divided by 2 = 0

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我一直在尝试使用我的android新IOIO，需要找到一个信号的频率。所以我把信号转换成二进制，然后用1除以1之间的时间，虽然当我这样做的时候，我发现我得到的输出是0。然后我决定看看1/2给了我什么，令我惊讶的是它也给了0！有人知道为什么会这样吗？代码：private float frequency = 1/2;这可能与使用Float.toString(frequency)有关吗

问Android -1除以2=0
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问Android -1除以2=0
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