CODEWITHSUNDEEP
iosswift
Cherry_thia
Cherry_thia

Reputation: 696

Swift zero divided by zero gives NAN

I am doing some calculation using Swift. I understand that in Swift, 0/0 gives NAN (not a number) instead of 0. Is there anyway for it to return 0 instead?

for x in 0..<n {
for y in 0..<n {
if(B[0,y,x]==NAN) {B[0,y,x]=0 }    //use of undeclared identifier 'NAN'

println("\((Float)B[0,y,x])")

}
}

Upvotes: 5

Views: 10628

Answers (2)

bluedome
bluedome

Reputation: 2459

NaN is defined in FloatingPointType protocol.
Which is the Swift equivalent of isnan()?

Then, if you want zero, how about using Overflow Operators?

let x = 1
let y = x &/ 0
// y is equal to 0

[UPDATED]

You can define custom overflow operator like this.

func &/(lhs: Float, rhs: Float) -> Float {
    if rhs == 0 {
        return 0
    }
    return lhs/rhs
}

var a: Float = 1.0
var b: Float = 0

// this is 0
a &/ b

Upvotes: 13

Jack Stroganov
Jack Stroganov

Reputation: 441

good answer from @bluedome, in case you want this as an extension and\or have any errors there is an answer

infix operator &/ {}

extension CGFloat {
    public static func &/(lhs: CGFloat, rhs: CGFloat) -> CGFloat {
        if rhs == 0 {
            return 0
        }
        return lhs/rhs
    }
}

then you can divide by zero

let a = 5
let b = 0
print(a &/ b) // outputs 0

Upvotes: 6

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