Because the program is looping continously and the data on the serial monitor just fly by. Is there a way to pause the serial monitor so I can view the result?
This is under Arduino IDE.
On the bottom left of the serial monitor is a button marked "Autoscroll" . Untick it.
If the advice @stowite gave is not sufficient you may need to ensure that your program only writes data to the Serial Monitor at reasonable intervals - perhaps once per second.
...R