Why does this function work to determined wether or not an input of an Integer is Odd or Even in Swi-CodePudding

func isOdd(n: Int) -> Bool {
    if n % 2 == 1 {
        return true
    } else {
        return false
    }
}

So this function basically has me confused. let's say I called the function and input 9

isOdd(in:9)

I know that 9 is an odd number but how does the code work. If I do the math that the code implies which is n(9)/2 it equals 4.5. This result is checked as implied by the 2 equal symbols with 1. 4.5 is not equal to 1 so why does it return True.

CodePudding user response：

modulus division, gives the reminder when the first int is divided by the second int and it returns an int. So n % 2 returns 0 or 1 as a int reminder. That is why your function works. You can simplify your function to this:

func isOdd(n: Int) -> Bool { n % 2 != 0 }