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CS1501 Programming Methods
Supermarket sales records
This is the assessment project for 2000
A supermarket is concerned that it might have run out of some goods before it closes at 21:00 hours, when all items will be
refilled by the overnight shelf-stackers. The managers of the supermarket would like to find those items that have run out, but
have found that sending a person to look at the shelves is expensive and unsatisfactory. They believe that an item of which the
last sale was before 16:00 hours may have run out. Your task is to find those items with no sales after this time, and report them
to the supermarket management.
The supermarket has available text files from the tills which show which items were sold when, with lines like
an item code which is an arbitrary string of alphanumeric characters
one or more spaces
a time on a 24 hour clock
1.write a function minutes( str24:string): integer which will convert a time in 24 hour format to the number
of minutes since 00:00.
2.file market1.txt contains data about a single item, with the times in order. Write a program to report the time of the last
sale, in minutes since 00:00, using writeln on a text screen.
Up to CAS 11 may be attained by presenting programs for this section.
3.file market2.txt contains data about one item, but the times are out of order. Write a program to find the last sale time of
the item, and report it, again using writeln on a text screen.
Up to CAS 14 may be attained by presenting programs for this section.
4.file market3.txt contains data about many items, again fewer than 1000, but because the data has come from several tills,
the times are shuffled. Write a program to find the last sale time of each item, and report the item codes and times of
items which were last sold before 16:00, and only those items, again using writeln on a text screen.
hint: create an array of records each of which contains an item code and the time of its last known sale.
Up to CAS 18 may be attained by presenting programs for this section.
5.Use file market3.txt again, but use binary search for looking up the strings.
Up to CAS 20 may be attained by presenting programs for this section.
This programming assignment will be assessed on the following criteria:
Does the program compile?
Does the program solve the problem that was set?
Does the program solve all parts of the problem that was set?
Style and Maintainability
Helpful layout ?
Sensible partition into subroutines?
Helpful, but not excessive, comments?
Solves the problem generally?
Survives unexpected inputs?
Permitted language constructs
You may use any Pascal you know. The problems are soluble with material that has been taught, but you are encouraged
to use any other constructs or methods.