Decimal to roman numeral converter in swift

Swift program for Decimal to roman numeral converter. Here mentioned other language solution.

import Foundation
//  Swift program for
//  Conversion from Decimal to roman number
class Perform
{
    // Display roman value of n
    static func result(_ n : Int)
    {
        switch(n) {
            // Test Cases
            case 1:
                print("I",terminator: "");
            case 4:
                print("IV",terminator: "");
            case 5:
                print("V",terminator: "");
            case 9:
                print("IX",terminator: "");
            case 10:
                print("X",terminator: "");
            case 40:
                print("XL",terminator: "");
            case 50:
                print("L",terminator: "");
            case 90:
                print("XC",terminator: "");
            case 100:
                print("C",terminator: "");
            case 400:
                print("CD",terminator: "");
            case 500:
                print("D",terminator: "");
            case 900:
                print("DM",terminator: "");
            case 1000:
                print("M",terminator: "");
            default:
                return;
        }
    }
    static func select(_ number : Int, _ collection : [Int], _ size : Int) -> Int
    {
        var n : Int = 1;
        var i : Int = 0;
        do
        {
            i = 0;
            while (i < size)
            {
                if (number >= collection[i])
                {
                    n = collection[i];
                }
                 else
                {
                    break;
                }
                i += 1;
            }
        }
        Perform.result(n);
        // Reduce the value of number
        return number - n;
    }
    static func romanNo(_ num : Int)
    {
      	var number = num;
        if (number <= 0)
        {
            // When is not a natural number
            return;
        }
        // Base case collection
        let collection : [Int] =
        [1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000];
        // Get the size of collection
        let size : Int = collection.count;
        print(" \(number) ",terminator: ": ");
        while (number > 0)
        {
            number = Perform.select(number, collection,size);
        }
        // Add new line
        print();
    }
    static func main(_ args : inout [String])
    {
        // Test Case
        Perform.romanNo(10);
        Perform.romanNo(18);
        Perform.romanNo(189);
        Perform.romanNo(604);
        Perform.romanNo(982);
        Perform.romanNo(3000);
    }
}

var record : [String] = CommandLine.arguments;
Perform.main(&record);

Output

 10 : X
 18 : XVIII
 189 : CLXXXIX
 604 : DCIV
 982 : DMLXXXII
 3000 : MMM



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