Day 8, Checkpoint 4 of #100DaysOfSwiftUI ... #HACKINGWITHSWIFT https://www.hackingwithswift.com/quick-start/beginners/checkpoint-4

100DaysOfSwitfUI - Day 8 - Checkpoint 4.swift

enum IntegerSqrtError : Error {
    case outOfBounds, noRoot
}

func isqrt(_ n: Int) throws -> Int {
    
    if n < 1 || n > 10_000 {
        throw IntegerSqrtError.outOfBounds
    }
    
    for i in 1...100 {
        if i*i == n {
            return i
        }
    }
    
    throw IntegerSqrtError.noRoot
}

for n in [-1,0,1,2,4,5,6,9,16,20,25,999,10_000,10_001] {
    print("\(n):")
    do {
        print("  isqrt(\(n))=\(try isqrt(n))")
    }   catch IntegerSqrtError.outOfBounds {
        print("  number out of bounds error")
    }   catch IntegerSqrtError.noRoot {
        print("  no int sqrt for the given number")
    }   catch {
        print("  an error occured")
    }
}