# Introduction to Swift

Apr 24 2024 · Swift 5.10, iOS 17, Xcode 15

## Lesson 04: Problem Solving

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Writing 100 percent bug-free code is a myth. There’s no shame in having some bugs in your code, but it’s important to have them under control and not have too many of them that give your users a negative experience.

``````calculateSum(minValue: -10, maxValue: 10)
calculateSum(minValue: 10, maxValue: -10)
``````
``````calculateSum(minValue: 1, maxValue: 10)
``````
``````calculateSum(minValue: 0, maxValue: Int.max)
``````
``````var sum: Double = 0
``````
``````func calculateSum(minValue: Int, maxValue: Int) -> Double {
``````
``````let doubleVal1 = Double(minValue)
let doubleVal2 = Double(maxValue)
``````
``````sum = (doubleVal1 + doubleVal2) / 2.0
sum *= doubleVal2 - doubleVal1 + 1.0
``````