Day 1

Data Types

The variables i, d, and s are already declared and initialized for you. You must:

Declare 3 variables: one of type int, one of type double, and one of type String.
Read 3 lines of input from stdin (according to the sequence given in the Input Format section below) and initialize your 3 variables.

Use the operator to perform the following operations:

    
Print the sum of `i` plus your int variable on a new line.
Print the sum of `d` plus your double variable to a scale of one decimal place on a new line.
Concatenate `s` with the string you read as input and print the result on a new line.

i = 4
d = 4.0
s = 'HackerRank '
# Declare second integer, double, and String variables.

int2 = int(input())
double = float(input())
string = str(input())

# Read and save an integer, double, and String to your variables.

# Print the sum of both integer variables on a new line.

print(i + int2)

# Print the sum of the double variables on a new line.

print(d + double)

# Concatenate and print the String variables on a new line

print(s + string)

Day 4

Class vs Instance

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 initialAge 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, you must 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..

class Person:

    def __init__(self,initialAge):
        if initialAge > 0 :
            self.initialAge = initialAge
        else:
            print('Age is not valid, setting age to 0.')
            self.initialAge = 0
        
    def amIOld(self):
        if self.initialAge < 13:
            print('You are young.')
        elif self.initialAge >=13 and self.initialAge < 18:
            print('You are a teenager.')
        else:
            print('You are old.')
        
    def yearPasses(self):
        # Increment the age of the person in here
        self.initialAge+=1
        

Day 7

Arrays

Given an array, A, of N integers, print A’s elements in reverse order as a single line of space-separated numbers.

if __name__ == '__main__':
    n = int(input())

    arr = list(map(int, input().rstrip().split()))
    des_n = n-1
    reverse_array = []
    
    while des_n >= 0:
        reverse_array.append(arr[des_n])
        des_n -= 1
   
    for i in reverse_array:
        print(i, end=' ')
        

HackerRankProblems