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Start your free trialMartin Lynnerup
3,134 PointsSimple function returns stange results
After completing the course "Building a Simple iOS App with Swift" I'm playing around with creating different simple apps. I created the below function to calculate my treadmill speed at the gym, but the values it returns are wrong.
I suspect it might have something to do with how you calculate decimal numbers, but I havn't been able to solve it.
Example: DifficultyLevel: 8 running speed = (18/10) * 8 = 14,4 But the function return is 8
Can you please help me? Thanks!
func Speed(level difficultyLevel:Int) -> Int {
// difficulty level is from 1-10 where 10 is max
let topSpeed: Int = 18
let topSpeedDivided: Int = topSpeed/10
let runningSpeed: Int = topSpeedDivided * difficultyLevel
return runningSpeed
}
1 Answer
Steve Hunter
57,712 PointsHi Martin,
Yes, this is because you are using integers. With integer division, 18/10 is 1; there is only one whole 10 in 18. Then you are multiplying 1 by 8, so the function returns 8.
I'd suggest switching the datatype to Double
rather than Int
. This will then handle the fractional part of the expressions.
Steve.
Martin Lynnerup
3,134 PointsMartin Lynnerup
3,134 PointsThought I had tried that already, but this time it worked ;)
Thanks a lot!
Steve Hunter
57,712 PointsSteve Hunter
57,712 PointsNo problem!