04. Print Name of Numbers

#include <iostream>

using namespace std;

string unitsPrint(int n) {
    return
        (n == 1 ? "one" :
            n == 2 ? "two" :
            n == 3 ? "three" :
            n == 4 ? "four" :
            n == 5 ? "five" :
            n == 6 ? "six" :
            n == 7 ? "seven" :
            n == 8 ? "eight" :
            n == 9 ? "nine" : "");
}

string tensPrint(int t, int u) {
    string result =
        t == 1 ? (
            u == 0 ? "ten" :
            u == 1 ? "eleven" :
            u == 2 ? "twelve" :
            u == 3 ? "thirteen" :
            u == 4 ? "fourteen" :
            u == 5 ? "fifteen" :
            u == 6 ? "sixteen" :
            u == 7 ? "seventeen" :
            u == 8 ? "eighteen" :
            "nineteen"
            ) :
        t == 2 ? "twenty" :
        t == 3 ? "thirty" :
        t == 4 ? "forty" :
        t == 5 ? "fifty" :
        t == 6 ? "sixty" :
        t == 7 ? "seventy" :
        t == 8 ? "eighty" :
        t == 9 ? "ninety" : "";

    return (t > 0 ? result + " " : "");
}

string hundredsPrint(int n) {
    return (n > 0 ? unitsPrint(n) + " hundred " : "");
}

string thousandsPrint(int n) {
    return (n > 0 ? unitsPrint(n) + " thousand " : "");
}

int main() {
    string n;
    cin >> n;

    n = "000" + n;

    int thousands = int(n[n.length() - 4]) - 48;
    int hundreds = int(n[n.length() - 3]) - 48;
    int tens = int(n[n.length() - 2]) - 48;
    int units = int(n[n.length() - 1]) - 48;

    cout << (thousands + hundreds + tens + units != 0
        ? thousandsPrint(thousands) + hundredsPrint(hundreds) + tensPrint(tens, units) + (tens != 1 ? unitsPrint(units) : "")
        : "zero") << endl;

    return 0;
}