void start()
{
   double lot = 0.1;            // so 1 pip = 1 dollar
    if(Volume[0] != 1) return;   // only trade on candle beginning
    pipValue = get_pip_value();  // get pip value

    //
    // PUT YOUR CODE BELOW HERE:
    //

    // exit trades based on signal line <-> buffer
    double macd_histogram  = get_MACD(0, 1, InpFastEMA, InpSlowEMA, InpSignalSMA);
    double macd_line       = get_MACD(1, 1, InpFastEMA, InpSlowEMA, InpSignalSMA);

    if(macd_histogram > macd_line) { close_orders(-1); }  // close shorts when histogram is above signal
    if(macd_histogram < macd_line) { close_orders(+1); }  // close longs when histogram is beyond signal

    // enter trades based on a zero-line cross
    double macd_histogram_now  = get_MACD(0, 1, InpFastEMA, InpSlowEMA, InpSignalSMA); // 1 bar  in past; mode is 0 for histogram
    double macd_histogram_past = get_MACD(0, 2, InpFastEMA, InpSlowEMA, InpSignalSMA); // 2 bars in past; mode is 0 for histogram

    if(macd_histogram_past < 0 && macd_histogram_now > 0) // macd histogram crossed from beyond -> above zero line
       if(open_trades() == 0) // only 1 open trade at a time
          trade (+1);

    if(macd_histogram_past > 0 && macd_histogram_now < 0) // macd histogram crossed from above -> beyond zero line
       if(open_trades() == 0)  // only 1 open trade at a time
          trade (-1);
}