将双精度转换为整数 [英] convert double to 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

如果您想要默认的 truncate-towards-zero 行为，您可以使用强制转换.或者，您可能想要使用 Math.Ceiling、Math.Round、Math.Floor 等 - 尽管之后您仍然需要进行演员表.

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.

不要忘记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，则从 double 到 int 的转换不会引发异常，而调用到 Convert.ToInt32(double) 会.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)是明确未定义的.

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.

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