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WEEK 1 ASSIGNMENT Student grades

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CMPS 258 – PROGRAMMING LANGUAGES
WEEK 1 ASSIGNMENT
In this assignment, you will write simple SML functions that manipulate student grades in a class. Assume
that a student’s record is represented as a quadruple of type int*string*real*real which contains
the students ID, name, midterm exam grade, and final exam grade, respectively.
(1) Implement a function score that takes a student record and computes the student’s
composite score, assigning 40% to the midterm and 60% to the final.
(2) Implement a function scores that takes a list of student records and returns a list of pairs
of type int*real consisting of each student’s ID and composite score, respectively.
(3) Implement a function getByID that takes a list of student records and an integer i and
returns the record of the student whose ID is i. Assume the list contains the desired student
(do not worry about the case where the desired student is not in the list).
(4) Implement a function whoFailedMidterm that takes a list of student records and returns
a list of the names of the students who received less than 60 on the midterm exam.
(5) Implement a function allPassedFinal that takes a list of student records and returns
true if all the students received a grade greater than or equal to 60 on the final exam, and
false otherwise.
(6) Implement a function countPassedCourse that takes a list of student records and returns
the number of students who received a composite score greater than or equal to 60.
(7) Implement a function studentsInRange that takes a list of student records and a pair of
reals range and returns a list of the records of the students who received a composite score
in between #1 range and #2 range (exclusive).
(8) Implement a function countStudentsInRanges that takes a list of student records and
a list of pairs ranges and returns the number of students who received a composite score
in at least one of the ranges in ranges. The ranges may overlap so be careful not to doublecount students that fall in multiple ranges.
(9) Implement a function studentWithHighestScore that takes a list of student records
and returns the record of the student with the highest composite score. Assume the class
always has at least one student (do not check for the case when the list is empty).
(10)Implement a function insertAssignmentGrade that takes a list of student records and
a list of assignment grades and returns a list of amended student records that include the
assignment grade as a third field in the tuple (the returned list will have type
int*string*real*real*real). Assume that the two lists are of equal size (do not
check for the case where their size mismatches).
Evaluating a correct homework solution should generate the bindings below. However, keep in mind that
generating these bindings does not guarantee that your solutions are correct. Make sure to test your
functions before submitting.
val score = fn : int * string * real * real -> real
val scores = fn : (int * string * real * real) list -> (int * real) list
val getByID = fn
: (int * string * real * real) list * int -> int * string * real * real
val whoFailedMidterm = fn : (int * string * real * real) list -> string list
val allPassedFinal = fn : (int * string * real * real) list -> bool
val countPassedCourse = fn : (int * string * real * real) list -> int
val studentsInRange = fn
: (int * string * real * real) list * (real * real)
-> (int * string * real * real) list
val countStudentsInRanges = fn
: (int * string * real * real) list * (real * real) list -> int
val studentWithHighestScore = fn
: (int * string * real * real) list -> int * string * real * real
val insertAssignmentGrade = fn
: (int * string * real * real) list * real list
-> (int * string * real * real * real) list
Assessment
Solutions should be:
 Correct
 In good style, including indentation and line breaks
 Written using features discussed in class
Do not use pattern-matching. It will be used in the next assignment.
Submission Instructions
Put all your solutions in one SML file and submit it via Moodle. The file should be named “<id>.sml” where
<id> is your AUBnet ID (e.g., abc01.sml). Do not submit any other files or compressed folders.

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