浮点数精度问题
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Assessment
- Difficulty
- 1/5
- Estimated time
- Under an hour
- Newbie friendliness
- 20/100
- Issue type
- Documentation
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- java
- Domain
- documentation
Research direction
The issue contains Java examples explaining floating-point precision, but it names no file, test, or entry point and does not request a specific change. First identify where this explanation belongs in the repository; completion is undefined until the desired documentation update and its location are specified.
Written by the indexing model from the issue text.
Description
精度问题出现的本质原因是浮点数无法精确的表示大多数十进制小数，以下面的计算为例:
System.out.println(81.6 * 10);
System.out.println(81.6 * 100);
其输出结果是:
816.0
8159.999999999999
数字81.6在写出来之后就不是精确表示了，随后的计算所以也随之不准确。下面的除法是准确的:
System.out.println(816 / 100D);
因为对于整数，816和100都是可以精确表示的，所以最后的结果便是对的。
- Dominant language
- Java
- Stars
- 2k
- Forks
- 717
- PR merge metrics
- No merged PRs in 30d
Contributor guide
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First steps
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