## Help with Fortran 90

Hi i've recently started a summer school in fortran and they've set us our first task. I have got to a stage where i'm not quite sure how to progress.

This programming exercise involves writing software to help with the task of
timetabling courses for a fictitious university. The mathematics department at
UWGC offers 24 modules with codes A1..A8; B1..B8 and C1..C8. It has five
classrooms for its exclusive use: rooms 1 and 2 have 20 seats, room 3 has 30 and
rooms 4 and 5 can each take 50 students. Classes can be scheduled to begin on
the hour from 9.00 till 16.00 each day of the week (except Wednesday when the
last class is at 12.00).

The timetabler needs software to perform the following tasks:
• to print the current state of the timetable
• to answer a query about the usage of a given slot (i.e. room, day and time)
• to list which rooms are free at a given day and time
• to list the timetabled hours for any given course
• to allow the current state of the timetable to be changed by adding a module

code in a free timetable slot and/or deleting a course from an existing slot
When adding a module code in a slot, the software must check that the slot is actually
free and also make some tests on room size and possible timetable clashes.

(i) All ’A’ classes have 25 students
(ii) Classes B1..B6 have 15 students while B7 and B8 have 35
(iii) All ’C’ classes have at most 10 students
(iv) Courses B7 and B8 cannot run simultaneously

If the timetabler attempts to schedule a class which violates one or more of these
rules, the software should not accept it and print a warning message instead.
The software is to be menu-driven – that is, it should offer choices

Display a timetable (1)
Check a timetable slot (2)
Check free rooms at a given day and time (3)
Check timetabled slots for a given course (4)
Release a slot (5)
Allocate a slot (6)

Your solution must be implemented in terms of two-dimensional arrays. That is the variable mon (i,j)
should hold the module code of the class to be held on a Monday in room i( 1 < i < 5) at time j(9<j<16)
(If no class is scheduled then mon(i,j) could have a default value such as ’--’.)

Your solution must use function subprograms and/or subroutines – i.e., it is not to
consist of a single main program. For instance, the tests on room size ((i) - (iii),

The code must include comments which help a user understand
how to work with the software. In addition to your code you must hand in sample
output listings which show that you have tested all the features of the program.
It is advisable to build your software solution in stages – that is, to write and test
the program and subprograms for displaying the current timetable; then to add
(and test) further code for checking usage of a particular slot; and so on for all

My current coding

FUNCTION room_ok(K, M)
INTEGER :: K ! room number
CHARACTER(LEN=2) :: M ! module code
LOGICAL :: room_ok
! room_ok is returned as T if the number of seats in room K
! does not exceed the number of students on module M
! Otherwise it is returned as F

PROGRAM timetable
IMPLICIT NONE
CHARACTER(LEN=2), DIMENSION(1:5,9:16) :: mon, tue, wed, thu, fri
INTEGER, DIMENSION(1:5) :: roomsize
CHARACTER(LEN=2) :: mc
CHARACTER(LEN=3) :: day
INTEGER :: choice, room, hour
! Initialise room data
roomsize(1) = 20; roomsize(2) = 20; roomsize(3) = 30
roomsize(4) = 50; roomsize(5) = 50

! Initialise empty timetable
mon = ’--’; tue = ’--’; wed = ’--’; thu = ’--’; fri = ’--’
! non-trivial entries for testing
mon(2,10) = ’A4’; tue(3,12) = ’A4’; wed(4,16) = ’B6’
DO
SELECT CASE (choice)
CASE (1) ! Prints timetable for one day
PRINT"(’Which day (Mon - Fri)?’)": READ*,day
CALL Print_day(day)
...
CONTAINS
SUBROUTINE Menu ! prints option choices
PRINT"(/,’**** UWGC Timetable wizard ****’)"
PRINT"(’OPTIONS:’)"
PRINT"(’Display a timetable (1)’)"
PRINT"(’Check a timetable slot (2)’)"
PRINT"(’Check free rooms at a given day and time (3)’)"
PRINT"(’Check timetabled slots for a given course (4)’)"
PRINT"(’Release a slot (5)’)"
PRINT"(’Allocate a slot (6)’)"

SUBROUTINE Print_day(day) ! Prints timetable for day specified
CHARACTER(LEN=3), INTENT(in) :: day
SELECT CASE(day)
CASE(’Mon’)
CALL Print_times(mon)
CASE(’Tue’)
CALL Print_times(tue)
CASE(’Wed’)
CALL Print_times(wed)
CASE(’Thu’)
CALL Print_times(thu)
CASE(’Fri’)
CALL Print_times(fri)
CASE default
PRINT"(’Invalid day!’)"
END SELECT
END SUBROUTINE Print_day
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