HackerRank Day 4 Solution in Python: Class vs Instance

Today we will see the HackerRank Day 4 Solution in Python. The problem is named Class vs Instance which is part of 30 Days of code on HackerRank. Let’s get started!

Day 4: Class vs Instance Problem statement

We have to write a Person class with an instance variable, age, and a constructor that takes an integer, initialAge, as a parameter. The constructor must assign initialAge to age after confirming the argument passed as is not negative; if a negative argument is passed as initialAge, the constructor should set age to 0 and print Age is not valid, setting age to 0.. In addition, we should write the following instance methods:

yearPasses() should increase the age instance variable by 1.
amIOld() should perform the following conditional actions:
- If age<13, print You are young..
- If age>=13 and age<18, print You are a teenager..
- Otherwise, print You are old..

Sample Input

Sample Output

Age is not valid, setting age to 0.
You are young.
You are young.

You are young.
You are a teenager.

You are a teenager.
You are old.

You are old.
You are old.

You can solve the problem h ere.

HackerRank Day 4 Solution in Python

class Person:
    def __init__(self,initialAge):
        #Check is age is negative
        if initialAge<0:
            print("Age is not valid, setting age to 0.")
            self.age=0
        else:
            self.age=initialAge
    
    #Method to perform given conditional statements 
    def amIOld(self):
        #If age less than 13
        if self.age<13:
            print("You are young.")
        #If age greater than 13 and lesser than 18
        elif self.age>=13 and self.age<18:
            print("You are a teenager.")
        #If age greater than 18
        elifc self.age>18:
            print("You are old.")
    
    #Method to increment age
    def yearPasses(self):
        self.age+=1
        
t = int(input())
for i in range(0, t):
    age = int(input())         
    p = Person(age)  
    p.amIOld()
    for j in range(0, 3):
        p.yearPasses()       
    p.amIOld()
    print("")

Code Explanation

After getting the input, create an object for the Person class with input age as a parameter
Then in the constructor, check if the age is negative, then print Age is not valid, setting age to 0 and then setting the age value to 0. Else initialize age with the corresponding value
in the amIOld method check if the age is less than 13 and print You are young.
Then check if the age is greater than 13 and less than 18, then print You are a teenager.
If the age is greater than 18 then print You are old

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