Returns the compass bearing, in degrees, at the time of the last read().
Where Imu is the name you have given to the device in Project Designer.
In 3D the 'bearing' is also sometimes called 'yaw'.
Assuming you have called the sensor 'myIMU' in Project Designer you can dump the value to the standard output device as follows:
COMPASS_TYPE yaw = myIMU.getBearing();
COMPASS_TYPE roll = myIMU.getRoll();
COMPASS_TYPE pitch = myIMU.getPitch();
cout << "Yaw=" << yaw << " Roll=" << roll << " Pitch=" << pitch;