Hello, on Day 1, when talking about the difference between Int and Double numbers, it is said that both cannot operate on each other, unless specifically specified. However, when talking about being able to use compound assignment operators, the example given is the following: var rating = 5.0 rating *= 2

Aren't you supposed to be able to do that without using Double() or Int()?

Thank you!

Given code like:

var rating = 5.0
rating *= 2

the Swift compiler is smart enough to know that since rating is a Double (because it was initialized as 5.0) then it should interpret the 2 in rating *= 2 as a Double as well. It can't be an Int because you cannot multiple a Double by an Int without converting one of them, so 2 has to be a Double, in which case rating *= 2 is the same as writing rating *= 2.0

In situations where it is unambiguous as to whether a Double or an Int is meant, the compiler can figure it out for itself.