将 double 转换为 int

convert double to int(将 double 转换为 int)

问题描述

将 double 转换为 int 的最佳方法是什么?应该使用演员表吗?

What is the best way to convert a double to an int? Should a cast be used?

推荐答案

如果您想要默认截断为零的行为，您可以使用强制转换.或者，您可能想使用 Math.Ceiling、Math.Round、Math.Floor 等 - 尽管之后您仍然需要演员表.

You can use a cast if you want the default truncate-towards-zero behaviour. Alternatively, you might want to use Math.Ceiling, Math.Round, Math.Floor etc - although you'll still need a cast afterwards.

别忘了int的范围比double的范围小很多.如果值在未经检查的上下文中超出 int 的范围，从 double 到 int 的强制转换不会引发异常，而调用Convert.ToInt32(double) 将.如果值超出范围，则强制转换的结果(在未经检查的上下文中)显式未定义.

Don't forget that the range of int is much smaller than the range of double. A cast from double to int won't throw an exception if the value is outside the range of int in an unchecked context, whereas a call to Convert.ToInt32(double) will. The result of the cast (in an unchecked context) is explicitly undefined if the value is outside the range.

这篇关于将 double 转换为 int的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！