Возраст

#include <iostream>
using std::cout;
using std::cin;
using std::endl;

int main() {
    setlocale(LC_ALL, "Russian");
    int year, n, k, a, b;
    cin >> year;
    n = year / 10;
    cout << "Вам ";
    switch (n)
    {
    case 1:
        k = year % 10;
        switch (k)
        {
        case 0:
            cout << "десять ";
            break;
        case 1:
            cout << "один";
            break;
        case 2:
            cout << "две";
            break;
        case 3:
            cout << "три";
            break;
        case 4:
            cout << "четыр";
            break;
        case 5:
            cout << "пят";
            break;
        case 6:
            cout << "шест";
            break;
        case 7:
            cout << "сем";
            break;
        case 8:
            cout << "восем";
            break;
        case 9:
            cout << "девят";
            break;
        }
        if (k != 0)
        {
            cout << "надцать ";
        }
        break;
    case 2:
        cout << "двадцать ";
        break;
    case 3:
        cout << "тридцать ";
        break;
    case 4:
        cout << "сорок ";
        break;
    case 5:
        cout << "пятьдесят ";
        break;
    case 6:
        cout << "шестьдесят ";
        break;
    case 7:
        cout << "семьдесят ";
        break;
    case 8:
        cout << "восемьдесят ";
        break;
    case 9:
        cout << "девяносто ";
        break;
    case 10:
        cout << "сто ";
        break;
    }
    if ((n >= 2 && n <= 9)|| n==0)
    {
        k = year % 10;
        switch (k)
        {
        case 1:
            cout << "один ";
            break;
        case 2:
            cout << "два ";
            break;
        case 3:
            cout << "три ";
            break;
        case 4:
            cout << "четыре ";
            break;
        case 5:
            cout << "пять ";
            break;
        case 6:
            cout << "шесть ";
            break;
        case 7:
            cout << "семь ";
            break;
        case 8:
            cout << "восемь ";
            break;
        case 9:
            cout << "девять ";
            break;
        }
    }
    a = year % 10;
    b = year % 100;
    if (a == 1 && b != 11)
    {
        cout << "год " << endl;
    }
    else if (a >= 2 && a <= 4 && (b < 10 || b >= 20))
    {
        cout << "года " << endl;
    }
    else
    {
        cout << "лет "<<endl;
    }
    return 0;
}