Python program to calculate the sum of natural numbers

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In this program, you will learn to use the recursive function to calculate the sum of natural numbers.

To understand this example, you should understand the followingPython programmingTopic:

• Python if ... else statement

• Python function

• Python recursion

In the following program, we use the recursive function recur_sum() to calculate the total sum of the given numbers.

Source code

#　Python program to calculate the sum of natural numbers
def　recur_sum(n):
　　　if　n　<=　1:
　　　　　　　return　n
　　　else:
　　　　　　　return　n　+　recur_sum(n-1)
#　Change this value to get different results
num　=　16
if　num　<　0:
　　　print("Enter a positive number")
else:
　　　print("The sum is", recur_sum(num))

Output result

The sum is　136

Note:To test another number in the program, please change the value of num.

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