function ...!

[lONLEY]

hi people ...
anyone can help me to devide this code into one function or more i couldnt do it i tried for 3hr
i will use this function to make sure that the user input the time as HH:MM:SS

 
bool isValidTime(int, int, int);
const char delim = ':';

int main() { string in;
    stringstream ss;
    char c1, c2;
    int hr, min, sec;

    cout << "Enter HH:MM:SS : " << endl;
    while (true) {
        cout << "> ";
        getline(cin,in);
        ss.clear(); ss.str(in);
        if ((ss >> hr >> c1 >> min >> c2 >> sec) &&
                (c1 == delim) && (c1 == c2) &&
                isValidTime(hr, min, sec)) {
            cout << "ok" << endl;
        } else {
            cout << "invalid time" << endl;
        }
    }

[lONLEY]

?????