Random number with switch statements

Connor, if you put this code in a Playground and run it a few times you will see that each time it runs you get a different random number, as well as one of the 5 letters:

var randomTemperature = Int(arc4random_uniform(UInt32(150)))

switch randomTemperature {
case 0..<32: print("A")
case 32..<45: print ("B")
case 45..<70: print("C")
case 70..<100: print("D")
default: print("E")
}

randomTemperature will be a number between 0 and 149, and depending on what number it is, the appropriate case statement will print a letter.

Note: I changed Pasan's code slightly, so that each case was mutually exclusive, and E would be printed for numbers between 100 and 149.

I was also able to run the original code in the Playground, and was able to get a variety of random numbers, as well as the correct print statements to those numbers. I was just curious why Pasan's code seems to not behave as intended.