Sum of natural numbers in python

Description

Python program to get input n and calculate the sum of first n natural numbers.
Input:
5
Output:
15(1+2+3+4+5)

Solution

n=int(input("Enter n value:"))
sum=0
for i in range(1,n+1):
    sum+=i
print(sum)
    

Explanation

For Statement is used to execute the sequence of intruction repeatedly.
Range() method gives list of elements, here range() method gives list which has 1,2,3... to n.
for statement executes the instructions iteratively and for takes the elements one by one as value of i in sequential manner.
so it adds i with sum1 in every iteration, finally produces sum of natural numbers.



Interesting Pattern Programs: for more Patterns

Input:
5
Output:
*
**
***
****
*****
****
***
**
*Solution
Input:
5
Output:
    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *Solution
Input:
5
Output:
*        *
**      **
***    ***
****  ****
**********Solution
Input:
5
Output:
*       *
**     **
***   ***
**** ****
*********Solution
Input:
5
Output:
*       *
**     **
***   ***
**** ****
*********
**** ****
***   ***
**     **
*       *Solution
Input:
5
Output:
*********
 *******
  *****
   ***
    *
   ***
  *****
 *******
*********Solution