ios ios如何检查除法余数是否为整数
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/14129649/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
ios how to check if division remainder is integer
提问by Juan
any of you knows how can I check if the division remainder is integer or zero?
你们中的任何人都知道如何检查除法余数是整数还是零？
if ( integer ( 3/2))
回答by Jesse Black
You should use the modulo operator like this
您应该像这样使用模运算符
// a,b are ints
if ( a % b == 0) {
// remainder 0
} else
{
// b does not divide a evenly
}
回答by Rion Williams
It sounds like what you are looking for is the modulo operator %, which will give you the remainder of an operation.
听起来您正在寻找的是 modulo operator %，它将为您提供运算的其余部分。
3 % 2 // yields 1
3 % 1 // yields 0
3 % 4 // yields 1
However, if you want to actually perform the division first, you may need something a bit more complex, such as the following:
但是，如果您想先实际执行除法，则可能需要一些更复杂的内容，例如以下内容：
//Perform the division, then take the remainder modulo 1, which will
//yield any decimal values, which then you can compare to 0 to determine if it is
//an integer
if((a / b) % 1 > 0))
{
//All non-integer values go here
}
else
{
//All integer values go here
}
Walkthrough
演练
(3 / 2) // yields 1.5
1.5 % 1 // yields 0.5
0.5 > 0 // true
回答by Hussein Dimessi
swift 3:
快速3：
if a.truncatingRemainder(dividingBy: b) == 0 {
//All integer values go here
}else{
//All non-integer values go here
}
回答by DILIP KOSURI
You can use the below code to know which type of instance it is.
您可以使用以下代码来了解它是哪种类型的实例。
var val = 3/2
var integerType = Mirror(reflecting: val)
if integerType.subjectType == Int.self {
print("Yes, the value is an integer")
}else{
print("No, the value is not an integer")
}
let me know if the above was useful.
如果以上有用，请告诉我。
回答by maxwell
Swift 5
斯威夫特 5
if numberOne.isMultiple(of: numberTwo) { ... }
Swift 4 or less
Swift 4 或以下
if numberOne % numberTwo == 0 { ... }
回答by Programer_saeed
Swift 2.0
斯威夫特 2.0
print(Int(Float(9) % Float(4))) // result 1
