The program:

   count-size

reads the standard input and report information about
what was read.  Any file can be provided as the input;
the file 'data/fox_story' contains the data used in the book.

The program:

   directcall

reads two Sales_item transactions from the standard input.
The file 'data/add_item' contains two such transactions.

Programs not listed above print output and do
not read any input