Can you write a program for adding a series of natural numbers without using any kind of loop?

Question

solutions using bitwise operators are most welcome.

Answer 1

you can use the formula sum = n(n+1)/2 where n is the number of natural numbers you want to add. (it adds 1+2+3+4.....+n)

To add numbers from x to n, you can use. sum = (n(n+1) - x(x+1)) / 2

EDIT: I didn't see that the previous post already covered it.

Answer 2

If it's just within a range, you can easily use Gauss' formula to solve it. Here's a reference:
https://betterexplained.com/articles/techniques-for-adding-the-numbers-1-to-100/

Answer 3

I am talking about sequence where we have a starting number and an ending number. e.g. sum of number between 5 & 50.

Answer 4

@Jan Markus, quite correct, but there's still implicit loop in it.