Python Program for Even/Odd and Sum of N Natural Numbers

Check if a Number is Even or Odd in Python

Given an integer input, the objective is to determine whether a number is even or odd using Python programming.

An even number is completely divisible by 2, whereas an odd number leaves a remainder of 1 when divided by 2.

Example:

Input: Num = -5

Output: The number is Negative

Methods to Check Even or Odd

Method 1: Using Brute Force
Method 2: Using Nested if-else Statements
Method 3: Using the Ternary Operator

Sum of First N Natural Numbers (Python)

Natural numbers are a sequence of positive numbers starting from 1. The sum of the first N natural numbers can be calculated using different methods.

Method 1: Using for Loop (Python)

n = int(input("Kindly Insert an Integer Variable: "))
sum = 0
for i in range(1, n + 1):
    sum += i
print("Sum of Natural Numbers =", sum)

Output:

Kindly Insert an Integer Variable: 3 
Sum of Natural Numbers = 6

Method 2: Using Formula (Python)

n = int(input("Kindly Insert an Integer Variable: "))
sum = n * (n + 1) // 2
print("Sum of Natural Numbers =", sum)

Output:

Kindly Insert an Integer Variable: 3 
Sum of Natural Numbers = 6

Method 3: Using Recursion (Python)

def getSum(n):
    if n == 0:
        return 0
    return n + getSum(n - 1)

n = int(input("Kindly Insert an Integer Variable: "))
print("Sum of Natural Numbers =", getSum(n))

Output:

Kindly Insert an Integer Variable: 3 
Sum of Natural Numbers = 6