My stupidity showing through!

#include <iostream>
#include <cstdlib>
#include <iomanip>

using namespace std;

void functionOne();
void functionTwo();
void functionThree();
void functionFour();
void functionFive();
void functionSix();
void functionSeven();
void functionEight();
void functionNine();
void functionTen();

int main()
{
    int randNum = 0;
    char ch = 'N';
    bool done = false;
    cout << "This will pick a function at random til you say 'y' or 'Y' for quitting!!!" << endl;
    randNum = rand() % 100;

    while (!done)
    {
        if (ch == 'y' || ch == 'Y')
            done = true;
        else
        {
            switch(randNum / 10)
            {
                case 0:
                    functionOne();
                    break;
                case 1:
                    functionTwo();
                    break;
                case 2:
                    functionThree();
                    break;
                case 3:
                    functionFour();
                    break;
                case 4:
                    functionFive();
                    break;
                case 5:
                    functionSix();
                    break;
                case 6:
                    functionSeven();
                    break;
                case 7:
                    functionEight();
                    break;
                case 8:
                    functionNine();
                    break;
                case 9:
                    functionTen();
                    break;
                default:
                    cout << "Something went terribly wrong!" << endl;
                    break;
            }
        }
        cout << "Number is: " << randNum << endl;
        cout << "Do you want to quit? (y/n): ";
        cin >> ch;
        cout << endl;
        randNum = rand() % 100;
    }

    return 0;
}
void functionOne()
{
    cout << "function one called" << endl;
}
void functionTwo()
{
    cout << "function two called" << endl;
}
void functionThree()
{
    cout << "function three called" << endl;
}
void functionFour()
{
    cout << "function four called" << endl;
}
void functionFive()
{
    cout << "function five called" << endl;
}
void functionSix()
{
    cout << "function six called" << endl;
}
void functionSeven()
{
    cout << "function seven called" << endl;
}
void functionEight()
{
    cout << "function eight called" << endl;
}
void functionNine()
{
    cout << "function nine called" << endl;
}
void functionTen()
{
    cout << "function ten called" << endl;
}