Decimal to roman numeral converter in c++

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

// Include header file
#include <iostream>
#include <string>
#include <vector>

//  stdc++11 program for
//  Conversion from Decimal to roman number
class Perform
{
    // Display roman value of n
    public:
    static void result(int n)
    {
        switch (n){
            // Test Cases
            case 1:
                std::cout << "I";
                break;
            case 4:
                std::cout << "IV";
                break;
            case 5:
                std::cout << "V";
                break;
            case 9:
                std::cout << "IX";
                break;
            case 10:
                std::cout << "X";
                break;
            case 40:
                std::cout << "XL";
                break;
            case 50:
                std::cout << "L";
                break;
            case 90:
                std::cout << "XC";
                break;
            case 100:
                std::cout << "C";
                break;
            case 400:
                std::cout << "CD";
                break;
            case 500:
                std::cout << "D";
                break;
            case 900:
                std::cout << "DM";
                break;
            case 1000:
                std::cout << "M";
                break;
                    }
    }
    static long select(long number, 
        std::vector<int> collection, 
        int size)
    {
        int n = 1;
        int i = 0;
        for (
        i = 0; i < size; ++i)
        {
            if (number >= collection[i])
            {
                n = collection[i];
            }
            else
            {
                break;
            }
        }
        Perform::result(n);
        // Reduce the value of number
        return number - n;
    }
    static void romanNo(long number)
    {
        if (number <= 0)
        {
            // When is not a natural number
            return;
        }
        // Base case collection
      	// We used an vector you can do with an array
        std::vector<int> collection{1, 4, 5, 9, 10, 
          40, 50, 90, 100, 400, 500, 900, 1000};
        // Get the size of collection
        int size = collection.size();
        std::cout << " " + std::to_string(number) + " : ";
        while (number > 0)
        {
            number = Perform::select(number, collection, size);
        }
        // Add new line
        std::cout << std::endl;
    }

};
int main(int argc, char **argv){
    // Test Case
    Perform::romanNo(10);
    Perform::romanNo(18);
    Perform::romanNo(189);
    Perform::romanNo(604);
    Perform::romanNo(982);
    Perform::romanNo(3000);
    return 0;
};

Output

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