With this homework I got a lot of trouble because one of the topics for making this program was difficult for me a lot of people was trying this code in various ways so I try the one one of my friends told me to see.
https://talkingchalkpassingby.wordpress.com/
his blog post was good and I really could understand what the code was explaining to me in a way I could use it in the computer so I used this code as a reference for mine.
Salva blog 