Swift Examples
Dave Braunschweig
Counting
// This program demonstrates While, Do, and For loop counting using // user-designated start, stop, and increment values. // // References: // https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html import Foundation func getValue(name: String) -> Int { var value : Int print("Enter " + name + " value:") value = Int(readLine()!)! return value } func demonstrateWhileLoop(start: Int, stop: Int, increment: Int) { print("While loop counting from " + String(start) + " to " + String(stop) + " by " + String(increment) + ":") var count : Int count = start while count <= stop { print(count) count = count + increment } } func demonstrateDoLoop(start: Int, stop: Int, increment: Int) { print("Do loop counting from " + String(start) + " to " + String(stop) + " by " + String(increment) + ":") var count : Int count = start repeat { print(count) count = count + increment } while count <= stop } func demonstrateForLoop(start: Int, stop: Int, increment: Int) { print("For loop counting from " + String(start) + " to " + String(stop) + " by " + String(increment) + ":") for count in stride(from: start, through: stop, by: increment) { print(count) } } func main() { var start : Int var stop : Int var increment : Int start = getValue(name: "starting") stop = getValue(name: "ending") increment = getValue(name: "increment") demonstrateWhileLoop(start: start, stop: stop, increment: increment) demonstrateDoLoop(start: start, stop: stop, increment: increment) demonstrateForLoop(start: start, stop: stop, increment: increment) } main()
Output
Enter starting value: 1 Enter ending value: 3 Enter increment value: 1 While loop counting from 1 to 3 by 1: 1 2 3 Do loop counting from 1 to 3 by 1: 1 2 3 For loop counting from 1 to 3 by 1: 1 2 3