Functions
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#!/usr/bin/env swift; import Foundation func printHello() -> Void { print("Hello, world!") } // Begin Main printHello() exit(EXIT_SUCCESS)
Output
$ swiftc Functions1.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#!/usr/bin/env swift; import Foundation func printHello(_ name:String) -> Void { print("Hello, " + name + "!") } // Begin Main printHello("Fred") printHello("Wilma") printHello("Barney") printHello("Betty") exit(EXIT_SUCCESS)
Output
$ swiftc Functions2.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#!/usr/bin/env swift; import Foundation import Utils func squared(_ j:Int) -> Int { return j * j } // Begin Main for i:Int in 1...10 { print(Utils.format("{0:d}^2 = {1:d}", i, squared(i))) } exit(EXIT_SUCCESS)
Output
$ swiftc Functions3.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#!/usr/bin/env swift; import Foundation import Utils func exponentiation(_ base:Double, _ powerArg:Int) -> Double { var power:Int = powerArg var result:Double = 1 while power > 0 { result *= base power -= 1 } return result } // Begin Main for b:Double in stride(from: 1.1, to: 2.05, by: 0.1) { for p:Int in 2...10 { print(Utils.format("{0:f} ^ {1:d} = {2:f}", b, p, exponentiation(b, p))) } } exit(EXIT_SUCCESS)
Output
$ swiftc Functions4.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#!/usr/bin/env swift; import Foundation import Utils func factorial(_ x:Int) -> Int64 { if x <= 1 { return 1 } return x * factorial(x - 1) } // Begin Main for x:Int in 1..<10 { print(Utils.format("{0:d}! = {1:d}", x, factorial(x))) } exit(EXIT_SUCCESS)
Output
File not found!: /kunden/homepages/39/d957328751/htdocs/pureprogrammer/swift/examples/output/Functions5.out
#!/usr/bin/env swift; import Foundation import Utils func reverseList(_ x:[String]) -> [String] { var y:[String] = [] for i:Int in stride(from: x.count - 1, through: 0, by: -1) { y.append(x[i]) } return y } // Begin Main var names:[String] = ["Fred", "Wilma", "Barney", "Betty"] for name in names { print("Hello, " + name + "!") } names = reverseList(names) for name in names { print("Hello, " + name + "!") } print(Utils.listToString(names)) exit(EXIT_SUCCESS)
Output
$ swiftc Lists6.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#!/usr/bin/env swift; import Foundation import Utils func convertKMtoMiles(_ x:[String: Int]) -> [String: Int] { var y:[String: Int] = [:] for planet in x.keys { y[planet] = Int(Double(x[planet]!) * 0.621371 + 0.5) } return y } // Begin Main var planetDiametersInKM:[String: Int] = [ "Mercury": 4879, "Venus": 12103, "Earth": 12756, "Mars": 6794, "Jupiter": 142985, "Saturn": 120534, "Uranus": 51115, "Neptune": 49534, "Pluto": 2374, "Ceres": 946, "Eris": 2326, "Makemake": 1430 ] var planetDiametersInMiles:[String: Int] = convertKMtoMiles(planetDiametersInKM) for planet in planetDiametersInMiles.keys { print(planet + " has a diameter of " + String(planetDiametersInMiles[planet]!) + " miles") } exit(EXIT_SUCCESS)
Output
$ swiftc Maps3.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#!/usr/bin/env swift; import Foundation import Utils func swap(_ x:(String, Int)) -> (Int, String) { var y:(Int, String) y = (x.1, x.0) return y } // Begin Main var pair1 = ("Hello", 5) var pair2:(Int, String) pair2 = swap(pair1) print(Utils.tupleToString(pair1) + " becomes " + Utils.tupleToString(pair2)) exit(EXIT_SUCCESS)
Output
$ swiftc Tuples3.swift -I . -L . -lUtils
error: link command failed with exit code 1 (use -v to see invocation)
ld: library not found for -lUtils
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Questions
- {{Who's on first?}}
- {{Who's on second?}}
- {{Who's on third?}}
Projects
More ★'s indicate higher difficulty level.
- Alouette Lyrics
- Bingo Lyrics
- 99 Bottles of Beer Lyrics
- Bubble Sort
- Calculate Euler's Number
- Compute π Function
- Compute π (Monte Carlo with Central Limit Theorem)
- Credit Card Validator
- The Farmer in the Dell (Revisited)
- Fibonacci Numbers
- Football Passer Rating (Revisited)
- GCD
- Insertion Sort
- LCG Pseudo-Random Number Generator
- License Plate Generator (Revisited)
- Merge Sort
- Min/Max Functions
- Old MacDonald Lyrics
- Quicksort
- Renard Numbers with Rounding Function
- Roman Numerals
- Sign Function
- Spreadsheet Columns
- Tower of Hanoi
- Twelve Days of Christmas Lyrics
References
- [[Swift Community]]
- [[Swift Language Guide]]
- [[Swift Language Reference]]
- [[Swift Programming Language]], Apple Inc.
- [[Swift Doc]]
- [[We Heart Swift]]
- [[Swift Cookbook]]
- [[Swift Playground]]
- [[Swift at TutorialsPoint]]
- [[Hacking with Swift]]