how to find the sum

How to Find Sum of Natural Numbers Using Recursion in Python?

Python Server Side Programming Programming

If a function calls itself, it is called a recursive function. In order to prevent it from falling in infinite loop, recursive call is place in a conditional statement.

Following program accepts a number as input from user and sends it as argument to rsum() function. It recursively calls itself by decrementing the argument each time till it reaches 1.

def rsum(n):     if n <= 1:         return n     else:         return n + rsum(n-1)  num = int(input("Enter a number: ")) ttl=rsum(num) print("The sum is",ttl)

Sample run of above program prints sum o natural numbers upto input number

Enter a number: 10 The sum is 55

Jayashree

Published on 05-Mar-2018 19:02:44

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