My solution to chapter 6 exercise 9, not exactly right

[punstress]

I have a feeling I didn't do this in the way he intended, especially since I didn't need to use his hint. Mine will print out 123 is 0 thousands, etc, which doesn't comply with the instructions. How did/would you do it?

(Read 1-4 digits and print how many thousands, hundreds, etc. E.g., 123 is 1 hundred and 2 tens and 3 ones.)

int usernum = 0;

void analyze(int usernum);

int main() {

    cout << "Enter a number from 0 to 9999: ";

    cin >> usernum;

    analyze(usernum);

}

void analyze(int usernum) {

    int num2 = usernum;

   

    if (num2 < 0 || num2 > 9999) cerr << "Number out of bounds.\n";

    else {

    int thousands = num2 / 1000;

    if (thousands != 0) num2 -= thousands*1000;

    int hundreds = num2 / 100;

    if (hundreds != 0) num2 -= hundreds*100;

    int tens = num2 / 10;

    if (tens !=0) num2 -= tens*10;

    int ones = num2;

    cout << usernum << " equals " << thousands << " thousand(s), " 

        << hundreds << " hundred(s), " << tens << " ten(s),  and " << ones << " one(s).\n";

    }

    keep_window_open();

}