Exercise was ment to teach conditional statements, so I used them all without anything else which would be (cheating in my opinion).

I changed input type int n to unsigned int n because of given constraints. It says that there can't be negative numbers, so we should use a proper type.

I have put Greater than 9 condition before all other because it is more likely that user will input greater number than 9. This way we prevent 9 statement checks which will make code execute faster in most cases.

This is the code:

		unsigned int n = stoi(ltrim(rtrim(n_temp)));

		if (n > 9)
        cout << "Greater than 9";
    else if (n == 1)
        cout << "one";
    else if (n == 2)
        cout << "two";
    else if (n == 3)
        cout << "three";
    else if (n == 4)
        cout << "four";
    else if (n == 5)
        cout << "five";
    else if (n == 6)
        cout << "six";
    else if (n == 7)
        cout << "seven";
    else if (n == 8)
        cout << "eight";
    else
        cout << "nine";