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iOS Swift 2.0 Collections and Control Flow Control Flow With Conditional Statements The Power of Switching

Connor Chappell
Connor Chappell
498 Points

Random number with switch statements

In the video, after the random number is generated, the playground has the number as 78 on the right hand side. But when the switch statements are implemented, the 0-32 range is printed out.

Shouldn't the 70-100 range be printed instead?

2 Answers

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.

Connor Chappell
Connor Chappell
498 Points

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.

Sorry, but I don't see how it doesn't "behave as intended"? It generates a random number, and then prints the phrase in the range that contains that number.

The only slight problem that I see is that he has case 32...45 when I think he meant 32..<54.