Can someone explain what this does?

hello there, iv been working bmp180 sparkfun , don't know chunk of code exactly. doesn't first loop current pressure , baseline altitude function library? if point of below?

code: [select]

double getpressure()
{
  char status;
  double t,p,p0,a;

  // must first temperature measurement perform pressure reading.
 
  // start temperature measurement:
  // if request successful, number of ms wait returned.
  // if request unsuccessful, 0 returned.

  status = pressure.starttemperature();
  if (status != 0)
  {
    // wait measurement complete:

    delay(status);

    // retrieve completed temperature measurement:
    // note measurement stored in variable t.
    // use '&t' provide address of t function.
    // function returns 1 if successful, 0 if failure.

    status = pressure.gettemperature(t);
    if (status != 0)
    {
      // start pressure measurement:
      // parameter oversampling setting, 0 3 (highest res, longest wait).
      // if request successful, number of ms wait returned.
      // if request unsuccessful, 0 returned.

      status = pressure.startpressure(3);
      if (status != 0)
      {
        // wait measurement complete:
        delay(status);

        // retrieve completed pressure measurement:
        // note measurement stored in variable p.
        // use '&p' provide address of p.
        // note function requires previous temperature measurement (t).
        // (if temperature stable, can 1 temperature measurement number of pressure measurements.)
        // function returns 1 if successful, 0 if failure.

        status = pressure.getpressure(p,t);
        if (status != 0)
        {
          return(p);
        }
        else serial.println("error retrieving pressure measurement\n");
      }
      else serial.println("error starting pressure measurement\n");
    }
    else serial.println("error retrieving temperature measurement\n");
  }
  else serial.println("error starting temperature measurement\n");
}


thanks insight this.

the code reads temperature , pressure connected sensor.

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