An Interest In:
Web News this Week
- April 2, 2024
- April 1, 2024
- March 31, 2024
- March 30, 2024
- March 29, 2024
- March 28, 2024
- March 27, 2024
Reading from the Standard Input (stdin) in Swift
There are many situations where we need to read input from StdIn. For instance, this is how inputs are provided in competitive programming websites such as Hackerrank.
Reading from StdIn
readLine() function is used to read the input from the user.
readLine(strippingNewLine: Bool)
Usually strippingNewLine
is set to true
, So that it will identify newline newline characters and character combinations are not a part of the input. Else, they will also be considered as the input.
And print()
function is used to write the output to StdIn.
Reading string from StdIn
let str = readLine(strippingNewline: true)!
It will be fine to force unwrap the String if we are sure about the situation else it may leads to crash.
Reading Int from StdIn
let str = Int(readLine(strippingNewline: true)!)!
Reading array of String from StdIn
let array = (readLine(strippingNewline: true))?.split {$0 == " "}.map (String.init)print(array!)
Reading array of Int from StdIn
import Foundationvar arr = readLine()!.components(separatedBy: " ").map{ (a: String)->(Int) in return Int(a)!}print(array!)
Testing
readline()
returns nil in Playgrounds. So, in order to use this function we need to create Command Line Tool application.
File -> New -> Project.. (or simply N) -> macOS -> Command Line Tool.
After creating the project we can use it just as Playgrounds.
Original Link: https://dev.to/rithvik78/reading-from-the-standard-input-stdin-in-swift-19n6
Dev To
An online community for sharing and discovering great ideas, having debates, and making friendsMore About this Source Visit Dev To