int和double之间的区别 [英] Difference between int and double

问题描述

我想知道是否有人可以告诉我为什么有人会使用int而不是double？
似乎double比int更灵活。

I was wondering if someone could tell me why anyone would use int instead of double? It seems to be that double is much more flexible than int.

谢谢

推荐答案

int 和 double 具有不同的语义。考虑分裂。 1/2 0 ， 1.0 / 2.0 是 0.5 。在任何给定的情况下，其中一个答案是正确的，另一个是错误的。

int and double have different semantics. Consider division. 1/2 is 0, 1.0/2.0 is 0.5. In any given situation, one of those answers will be right and the other wrong.

也就是说，有一些编程语言，比如JavaScript，其中有64位浮点数是唯一的数字数据类型。您必须显式截断某些除法结果，以获得与Java int 相同的语义。支持整数类型的Java等语言会对整数变量进行自动截断。

That said, there are programming languages, such as JavaScript, in which 64-bit float is the only numeric data type. You have to explicitly truncate some division results to get the same semantics as Java int. Languages such as Java that support integer types make truncation automatic for integer variables.

除了具有 double ， int 算术通常更快，较小的大小（32位与64位）可以更有效地使用缓存和数据传输带宽。

In addition to having different semantics from double, int arithmetic is generally faster, and the smaller size (32 bits vs. 64 bits) leads to more efficient use of caches and data transfer bandwidth.

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