# 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);
}
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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