Day_12_Inheritance.md

Day 12: Inheritance

Problem

Objective

Today, we're delving into Inheritance.

Task

You are given two classes, Person and Student, where Person is the base class and Student is the derived class. Completed code for Person and a declaration for Student are provided for you in the editor. Observe that Student inherits all the properties of Person.

Complete the Student class by writing the following:

• A Student class constructor, which has 4 parameters:
  • A string, firstName
  • A string, lastName
  • An integer, id
  • An integer array (or vector) of test scores, scores
• A char calculate() method that calculates a Student object's average and returns the grade character representative of their calculated average:

Input Format

The locked stub code in your editor calls your Student class constructor and passes it the necessary arguments. It also calls the calculate method (which takes no arguments).

You are not responsible for reading the following inğut from stdin:

The first line contains firstName, lastName, and id, respectively. The second line contains the number of test scores. The third line of space-separated integers describes scores.

Constraints

• 1 <= |firstName|, |lastName| <= 9
• |id| ≡ 7
• 0 <= score, average <= 100

Output Format

This is handled by the locked stub code in your editor. Your output will be correct if your Student class constructor and calculate() method are properly implemented.

Sample Input

Heraldo Memelli 8135627
2
100 80

Sample Output

Name : Memelli, Heraldo
ID: 8135627
Grade: 0

Explanation

This student had 2 scores to average : 100 and 80. The student's averagre grade is (100 + 80)/2 = 90. An average grade of 90 corresponds to the letter grade O, so our calculate() method should return the character 'O'

Given code

class Person:
	def __init__(self, firstName, lastName, idNumber):
		self.firstName = firstName
		self.lastName = lastName
		self.idNumber = idNumber
	def printPerson(self):
		print("Name:", self.lastName + ",", self.firstName)
		print("ID:", self.idNumber)

class Student(Person):
    #   Class Constructor
    #   
    #   Parameters:
    #   firstName - A string denoting the Person's first name.
    #   lastName - A string denoting the Person's last name.
    #   id - An integer denoting the Person's ID number.
    #   scores - An array of integers denoting the Person's test scores.
    #
    # Write your constructor here


    #   Function Name: calculate
    #   Return: A character denoting the grade.
    #
    # Write your function here

line = input().split()
firstName = line[0]
lastName = line[1]
idNum = line[2]
numScores = int(input()) # not needed for Python
scores = list( map(int, input().split()) )
s = Student(firstName, lastName, idNum, scores)
s.printPerson()
print("Grade:", s.calculate())

Solution

class Person:
	def __init__(self, firstName, lastName, idNumber):
		self.firstName = firstName
		self.lastName = lastName
		self.idNumber = idNumber
	def printPerson(self):
		print("Name:", self.lastName + ",", self.firstName)
		print("ID:", self.idNumber)

class Student(Person):

    def __init__(self, firstName, lastName, idNum, scores):
        Person.__init__(self, firstName, lastName, idNum)
        self.scores = scores

    def calculate(self):
        a = sum(scores) / len(scores)
        if 90 <= a <= 100:
            return "O"
        elif 80 <= a < 90:
            return "E"
        elif 70 <= a < 90:
            return "A"
        elif 55 <= a < 70:
            return "P"
        elif 40 <= a < 55:
            return "D"
        else:
            return "T"

line = input().split()
firstName = line[0]
lastName = line[1]
idNum = line[2]
numScores = int(input()) # not needed for Python
scores = list( map(int, input().split()) )
s = Student(firstName, lastName, idNum, scores)
s.printPerson()
print("Grade:", s.calculate())