Migliori studenti

Fa parte della sezione Logica e flusso del percorso GDScript di Coddy. Lezione 48 di 78.

Sfida

Facile

Infine, trova gli studenti migliori. Mantieni tutto ciò che hai scritto nei passaggi precedenti.

1. La funzione. Sotto le altre funzioni, scrivi filter_top_students(threshold: float) -> Array. Restituisce un array con i nomi degli studenti la cui media dei voti è maggiore di una soglia, nell'ordine in cui sono stati aggiunti. Calcola la media di ciascuno con calculate_average_grade(); uno studente senza voti ha una media di 0.0.

2. Il comando. Aggiungi un ramo per top <threshold>, come top 80, sopra ["show"]. Converte la soglia con float() e stampa l'array restituito da filter_top_students(). Per i comandi

add Alice 20 Math Physics
add Bob 22 Math Biology
add Diana 23 Chemistry Physics
grade Alice 90
grade Alice 85
grade Bob 75
grade Diana 95
top 80
top 90
top 100
exit

l'output è:

Student 'Alice' added successfully.
Student 'Bob' added successfully.
Student 'Diana' added successfully.
Grade 90 added for student 'Alice'.
Grade 85 added for student 'Alice'.
Grade 75 added for student 'Bob'.
Grade 95 added for student 'Diana'.
["Alice", "Diana"]
["Diana"]
[]
Goodbye!

Il tuo gestore dei record degli studenti ora combina dizionari, insiemi, array, funzioni e match in un unico programma.

Provalo tu

extends Node

# Ogni studente: nome -> {"age": int, "grades": Array, "courses": un insieme di nomi di corsi}
var student_records := {}

func _ready():
	while true:
		var parts := Array(OS.read_string_from_stdin().split(" ", false))
		match parts:
			["add", var student, var age, ..]:
				add_student(student, int(age), parts.slice(3))
			["grade", var student, var grade]:
				add_grade(student, int(grade))
			["enrolled", var student, var course]:
				print(is_enrolled(student, course))
			["average", var student]:
				var average := calculate_average_grade(student)
				if average >= 0:
					print("Average grade of '%s': %.2f" % [student, average])
			["course", var course]:
				print(list_students_by_course(course))
			["show"]:
				print(student_records)
			["exit"]:
				print("Goodbye!")
				break

func add_student(student_name: String, age: int, courses: Array) -> void:
	if student_records.has(student_name):
		print("Student '%s' already exists." % student_name)
		return
	var course_set := {}
	for course in courses:
		course_set[course] = true
	student_records[student_name] = {"age": age, "grades": [], "courses": course_set}
	print("Student '%s' added successfully." % student_name)

func add_grade(student_name: String, grade: int) -> void:
	if not student_records.has(student_name):
		print("Student '%s' not found." % student_name)
		return
	student_records[student_name]["grades"].append(grade)
	print("Grade %d added for student '%s'." % [grade, student_name])

func is_enrolled(student_name: String, course: String) -> bool:
	if not student_records.has(student_name):
		print("Student '%s' not found." % student_name)
		return false
	return student_records[student_name]["courses"].has(course)

func calculate_average_grade(student_name: String) -> float:
	if not student_records.has(student_name):
		print("Student '%s' not found." % student_name)
		return -1.0
	var grades: Array = student_records[student_name]["grades"]
	if grades.is_empty():
		return 0.0
	var total := 0
	for grade in grades:
		total += grade
	return float(total) / grades.size()

func list_students_by_course(course: String) -> Array:
	var students_in_course := []
	for student_name in student_records:
		if student_records[student_name]["courses"].has(course):
			students_in_course.append(student_name)
	return students_in_course