Decimal to roman numeral converter in ruby

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

#  Ruby program for
#  Conversion from Decimal to roman number

# Display roman value of n
def self.result( n)
    if (n==1)
        print("I")
    elsif(n==4)
        print("IV")
    elsif(n==5)
        print("V")
    elsif(n==9)
        print("IX")
    elsif(n==10)
        print("X")
    elsif(n==40)
        print("XL")
    elsif(n==50)
        print("L")
    elsif(n==90)
        print("XC")
    elsif(n==100)
        print("C")
    elsif(n==400)
        print("CD")
    elsif(n==500)
        print("D")
    elsif(n==900)
        print("DM")
    elsif(n==1000)
        print("M")
    end
end
def select( number,  collection,  size)
    n = 1
    i = 0
    i = 0
    while (i < size)
        if (number >= collection[i])
            n = collection[i]
        else
            break
        end
        i += 1
    end
    result(n)
    # Reduce the value of number
    return number - n
end
def romanNo( number)
    if (number <= 0)
        # When is not a natural number
        return
    end
    # Base case collection
    collection =
    [1, 4, 5, 9, 10, 40, 50, 90, 100, 
    400, 500, 900, 1000]
    # Get the size of collection
    size = collection.length
    print(" " + number.to_s + " : ")
    while (number > 0)
        number = select(number, 
            collection, size)
    end
    # Add new line
    print("\n")
end


# Test Case
romanNo(10)
romanNo(18)
romanNo(189)
romanNo(604)
romanNo(982)
romanNo(3000)

Output

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