Math divison in Swift

by

Your code is performing integer division, taking the integer result and converting it to a double. Instead, you want to convert these individual integers to doubles and then do the division. So, instead of

let result = (Double(myInt! / lutning) * Double(pi))

You should

let result = Double(myInt!) / Double(lutning) * Double(pi)

Note, Double already has a .pi constant, so you can remove your pi constant, and simplify the above to:

let result = Double(myInt!) / Double(lutning) * .pi

Personally, I’d define myInt and lutning to be Double from the get go (and, while we’re at it, remove all of the forced unwrapping (with the !) of the optionals):

guard
    let text = graderna.text,
    let text2 = radien.text,
    let value = Double(text),
    let value2 = Double(text2)
else {
    return
}

let lutning: Double = 360
let result = value / lutning * .pi

Or, you can use flatMap to safely unwrap those optional strings:

guard
    let value = graderna.text.flatMap({ Double($0) }),
    let value2 = radien.text.flatMap({ Double($0) })
else {
    return
}

let lutning: Double = 360
let result = value / lutning * .pi

(By the way, if you’re converting between radians and degrees, it should be 2π/360, not π/360.)

More Related Contents:

  1. Converting Yearly Salary to Weekly in Swift
  2. Getting the decimal part of a double in Swift
  3. How to get mathemical PI constant in Swift
  4. Round Double to closest 10
  5. How To make Label like below image in swift
  6. Precision String Format Specifier In Swift
  7. Swift generic coercion misunderstanding
  8. Catching NSException in Swift
  9. What is the difference between `let` and `var` in Swift?
  10. Sort Dictionary by keys
  11. Swift 2 – UnsafeMutablePointer to object
  12. How to generate a random number in Swift without repeating the previous random number?
  13. How to set cell spacing and UICollectionView – UICollectionViewFlowLayout size ratio?
  14. How can I remove the decimal part from JavaScript number?
  15. How can I use Swift’s Codable to encode into a dictionary?
  16. How to disable pasting in a TextField in Swift?
  17. Swift – SpriteKit CGPoint Alignment
  18. Providing a default value for an Optional in Swift?
  19. Swift variable name with ` (backtick)
  20. iterate over object class attributes in Swift
  21. Knowing where retain cycles are and removing them
  22. SwiftUI Drag and Drop files
  23. Using “if let…” with many expressions
  24. Swift – Custom setter on property
  25. SpriteKit physics in Swift – Ball slides against wall instead of reflecting
  26. What is the real benefit of using Raycast in ARKit and RealityKit?
  27. Standard way to “clamp” a number between two values in Swift
  28. Difference between SceneDelegate and AppDelegate
  29. Use Cocoapods with an App Extension
  30. How do I programmatically move an ARAnchor?

Leave a Comment