如何检查inf？Swift xcode7

如果计算结果不是无限的，如何签入Swift

我下面的代码在打印“dividepointsbyrest”后崩溃 inf”。“if dividepointsbyrest！=nil”检查是否为nil如果dividepointsbyrest！=inf'不起作用

var dividepointsbyrest = (BPMpoints / restDouble)
    print("dividepointsbyrest is") 
    print(dividepointsbyrest) 

    var BPMpercentD = 100.0 * dividepointsbyrest

---

Double

具有该属性的

isFinite

/

isFinite

属性

if dividepointsbyrest.isInfinite {
    print("dividepointsbyrest is infinite")
}

或

---

如果restDouble！=0{…}

，也许您还可以防止被零除。好主意，谢谢。restDouble不是零，但我正试图阻止除法返回inf-我认为问题在于它试图除以更大的数。我在检查，我想BPMpoints是零。我会努力证明你是对的，restDouble是零。好地方。因此，该代码将有所帮助

if dividepointsbyrest.isFinite {
    print("dividepointsbyrest is finite")
}