create a Python script with a recursive function to display the sum of the first n integers, where n is entered by the user.
Question
Create a Python script with a recursive function to display the sum of the first n integers, where n is entered by the user.
Solution
Sure, here is a step-by-step guide to create a Python script with a recursive function to display the sum of the first n integers:
Step 1: First, we need to define our recursive function. In Python, we define a function using the def
keyword. Let's call our function sum_of_integers
.
def sum_of_integers(n):
Step 2: Every recursive function needs a base case, i.e., a condition under which it will stop calling itself. In our case, the base case will be when n
is 0. If n
is 0, the function should return 0.
def sum_of_integers(n):
if n == 0:
return 0
Step 3: Next, we need to define the recursive case. In our case, the sum of the first n
integers is n
plus the sum of the first n-1
integers. We can express this in Python as follows:
def sum_of_integers(n):
if n == 0:
return 0
else:
return n + sum_of_integers(n-1)
Step 4: Now, we need to get the input from the user. We can use the input
function in Python for this. The input
function returns a string, so we need to convert this to an integer using the int
function.
n = int(input("Enter a number: "))
Step 5: Finally, we need to call our function with the user's input and print the result.
print(sum_of_integers(n))
Here is the complete script:
def sum_of_integers(n):
if n == 0:
return 0
else:
return n + sum_of_integers(n-1)
n = int(input("Enter a number: "))
print(sum_of_integers(n))
This script will ask the user to enter a number, calculate the sum of the first n
integers using a recursive function, and then print the result.
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