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iOS Swift Basics (retired) Control Flow If Statement

Posted by Ingrid Stevens
Ingrid Stevens
1,651 Points

What type are the numbers in a range (1...13)

when you have a statement like

let cards = 1...13

you are including the range 1 to <14. Does this mean that 13.999999 is included? Are the numbers in the range double or float or are they int?

1 Answer

kirkbyo
kirkbyo
15,791 Points
kirkbyo
kirkbyo
15,791 Points

When you are creating a range it is of type int. I tried playing around with it in a playground and I don't think it is possible to create a range of type float or double. So when creating a range of 1 to 5, you are only getting the whole numbers. If you want to try this out in a playground you can use a for-loop. 

let cards = 0...33
for items in cards {
    print("\(items) \n")
}

Hope this helped,

Ozzie

Ingrid Stevens
Ingrid Stevens
1,651 Points

Thanks Ozzie. I just saw the

 "0..<14"

in the standard editor output area and thought that it might include everything up to 14 but I suppose it's just an easy way to write "whole numbers up to 14."

I tried running your code and it spits out whole numbers. I tried putting Doubles in to the interval and it doesn't like it.

kirkbyo
kirkbyo
15,791 Points
kirkbyo
kirkbyo
15,791 Points

Is there a certain reason why you would like to use a float instead of an int?

Ingrid Stevens
Ingrid Stevens
1,651 Points

Nope, just wanted to see if it was possible because I saw the less than sign. Initially I was trying to see if a double like 5.9 was in the recognized range...not necessarily to make the range go from 3.9...7.9.

I tried this 

let tests = [1, 2.3, 3, 5]

for var i = 0; i < tests.count; i++ {
    switch tests {
    case 1...3:
        println("We can include doubles")
    default:
        println(tests)
    }
}

And based on the error it returns I don't think it is possible for a range to even contain a Double.