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iOS

Posted by Joe Hill
Joe Hill
15,063 Points

I typed out the equation into Xcode 2 ways and the answer was 197 both times. Does Swift 3 evaluate differently than 2?

I'm wondering if Swift 3 evaluates Operator Precedence differently than Swift 2. In the exercise were were asked to type out two equations, one with parentheses so that Xcode can evaluate different numbers in and order other than left to right. Yet when I typed the problem var x = 100 + 100 - 5 * 2 / 3 % 7 and var x = 100 + 100 - ((5 * 2) / 3) % 7 the answer came out to be 197 on both equations. Is Swift 3 evaluating things differently than Swift 2?

1 Answer

Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

Unfortunately I don't have Swift 2 on my devices anymore, but I really don't think precedence has changed. Actually, both equations are exactly the same and should return 197. You can omit the parenthesis and nothing would be different, they just emphasize what precedence looks like.

var x = 100 + 100 - 5 * 2 / 3 % 7
var y = 100 + 100 - ((5 * 2) / 3) % 7
Joe Hill
Joe Hill
15,063 Points

Ah ok. I guess I was thinking that the video was inferring that the equation would be different based on the parentheses emphasizing a different precedence for each equation. Thanks Martin!