> p
No entries
> f 2014
No entries
> c
Error processing command
> a 12345 2014 3.00
Book 12345 added
> a 12345 2014 3.00
Error processing command
> p
12345, 2014, 3
> a 67890 2012 4.50
Book 67890 added
> a 70000 2012 3.50
Book 70000 added
> p
12345, 2014, 3
67890, 2012, 4.5
70000, 2012, 3.5
> c
Average rating = 3.66667
> a 12233 2020 3.0
Book 12233 added
> s 1
> p
12233, 2020, 3
12345, 2014, 3
67890, 2012, 4.5
70000, 2012, 3.5
> s 3
> p
12233, 2020, 3
12345, 2014, 3
70000, 2012, 3.5
67890, 2012, 4.5
> s 2
> p
67890, 2012, 4.5
70000, 2012, 3.5
12345, 2014, 3
12233, 2020, 3
> d 12345
Book 12345 removed
> u 67890 2013 3.0
Book 67890 updated
> u 12645 2013 3.00
Error processing command
> p
67890, 2013, 3
70000, 2012, 3.5
12233, 2020, 3
> q
quit