Number 0 to 100 to text

// Number0To100ToText.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;

int main()
{

    int number;
    string []units = { "zero", "one", "two", "three", "four", "fife", "six", "seven", "eight", "nine" };
    string []tens = {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifeteen", "sixteen",
                      "seventeen", "eighteen", "nineteen"};
    string [] round = {"twenty", "thirty", "fourty", "sixty", "seventy", "eighty", "ninety"};
    cin >> number;

    if (number < 0 && number > 100)
    {
        cout << "invalid number" << endl;
    }
    else if (number >= 0 && number <= 9)
    {
        cout << "{0}" << units[number] << endl;
    }
    else if (number >= 10 && number <= 19)
    {
        cout <<"{0}" << tens[number - 10] << endl;
    }
    else if (number >= 20 && number <= 99)
    {
        if (number % 10 == 0)
        {
            cout << "{0}" << round[number / 10 - 2] << endl;
        }
        else
        {
            cout << "{0} {1}" << round[number / 10 - 2] << digits[number % 10] << endl;
        }
    }
    else
    {
        cout << "one hundred" << endl;
    }
return 0;
}