class Stop
{
    bool isRunning;
    clock_t time1;
    clock_t time2;
    double seconds;

    public:
        //Construct and initialise
        Stop();
        //Return current time of stopwatch
        void getTime();
        //Press button 1 to start or stop counting
        void pushButtonStartStop();
        //Press button 2 to reset time
        void pushButtonReset();
};

void Stop::pushButtonStartStop()
{
    if(isRunning == false)
    {
        isRunning = true;
        time1 = clock();

    }
    else
    {
        isRunning = false;
        time2 = clock();
        seconds += ((double)(time2-time1)/ CLOCKS_PER_SEC);
    }
}

Stop watch;
watch.pushButtonStartStop();
for(long i = 0; i< 100000000;i++)
{}