Sum of N natural numbers

Aim: Implement a program to find the sum of natural numbers up to n where n is provided by user.

Algorithm:

1.Start

2.Read the limit ‘n’

3. let i=0

4.for i<=n repeat steps 5&6

5.sum=sum+i

6.i=i+1

7.print sum

8.Stop

Program:

# take input from the user

num = int(input("Enter the limit: "))

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)

Output:

Enter the limit: 16

The sum is 136