如何确定双精度数是否为整数？ [英] How can you determine whether a double is an integer?

问题描述

在Swift 3中是否仍然可以确定双精度值是否具有小数位？在我的程序中，如果它是整数值，我只想对这个double进行计算。如何检查小数点后是否有非零数字？

Is there anyway in Swift 3 to determine whether a double value has decimal places or not? In my program, I only want to perform a calculation to this double if it is an integer value. How can I check to see if there's non-zero numbers after the decimal point?

例如：

let double dx = 1.0 // This would return true
let double dy = 1.5 // This would return false

任何帮助都将受到赞赏！谢谢，

Any and all help is appreciated! Thanks,

马修

推荐答案

extension Double {
    var isInt: Bool {
        let intValue = Int(self)
        return  Double(intValue) == self
    }
}

**当值超出Int范围时不起作用。

**Not working when value out of Int range.

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