Python Sum of Natural Numbers

by Online Tutorials Library July 22, 2022

Python Program to Find the Sum of Natural Numbers

Natural numbers:

As the name specifies, a natural number is the number that occurs commonly and obviously in the nature. It is a whole, non-negative number.

Some mathematicians think that a natural number must contain 0 and some don’t believe this theory. So, a list of natural number can be defined as:

See this example:

 num = int(input(“Enter a number: “))  if num < 0:    print(“Enter a positive number”) else:    sum = 0    # use while loop to iterate un till zero    while(num > 0):        sum += num        num -= 1    print(“The sum is”,sum) 

This example shows the sum of the first 100 positive numbers (0-100)

Output:

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