Python Program to find Sum of N Natural Numbers

Write a Python Program to find Sum of N Natural Numbers using While Loop, For Loop and Functions with example.

Python Program to find Sum of N Natural Numbers using For Loop

This Python program allows user to enter any integer value. Next, this program will calculate the sum of natural numbers from 1 to user specified value using For Loop.

# Python Program to find Sum of N Natural Numbers
 
number = int(input("Please Enter any Number: "))
total = 0

for value in range(1, number + 1):
    total = total + value

print("The Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total))

OUTPUT

Python Program to Calculate Sum of N Natural Numbers using While Loop

In this program, we just replaced the For Loop with While Loop

# Python Program to find Sum of N Natural Numbers
 
number = int(input("Please Enter any Number: "))

total = 0
value = 1

while (value <= number):
    total = total + value
    value = value + 1

print("The Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total))

OUTPUT

Python Program to calculate Sum of N Natural Numbers using Functions

In this program, we created a new function to find sum of natural numbers. Inside this function, we used If Else statement

# Python Program to find Sum of N Natural Numbers
 
def sum_of_n_natural_numbers(num):
    if(num == 0):
        return num
    else:
        return (num * (num + 1) / 2)
    
number = int(input("Please Enter any Number: "))

total_value = sum_of_n_natural_numbers(number)

print("Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total_value))

OUTPUT

Python Program to Calculate Sum of N Natural Numbers using Functions

This program is same as above example, but this time we are using Recursion.

# Python Program to find Sum of N Natural Numbers
 
def sum_of_n_natural_numbers(num):
    if(num == 0):
        return num
    else:
        return (num + sum_of_n_natural_numbers(num - 1))
    
number = int(input("Please Enter any Number: "))

total_value = sum_of_n_natural_numbers(number)

print("Sum of Natural Numbers from 1 to {0} =  {1}".format(number, total_value))

OUTPUT