When the modulus of a negative number is calculated, the result will either be negative or zero. Thus, comparing the modulus of a variable for
equality with a positive number (or a negative one) could result in unexpected results.
Noncompliant code example
func isOdd(x:Int) -> Bool {
return x % 2 == 1 // Noncompliant; if x is negative, x % 2 == -1
}
Compliant solution
func isOdd(x:Int) -> Bool {
return x % 2 != 0
}
or
func isOdd(x:Int) -> Bool {
return abs(x % 2) == 1
}
