Flexing his shredded abs on us! Cool solution!

El resultado está claro, pero... faltaría por declarar la librería a la que corresponde la función"abs()", es decir: #include <math.h>.

I think that the result/return is understandable, but... you have not declared the library for the use of the "abs()" function, I mean: #include <math.h>.

Thanks a lot for your solution!

It's fancy, but it will make a function call and therefore be slower than other functions.

Very smart!

Missing #include <stdlib.h>.

Fancy

Dear rndd-AK,

what do You mean by "call instead"? If I understand correctly, using of "if then else" isn't obligatory. My opinion: more solutions - more fun :)

Nevertheless - this is a very good question, see below for the more detailed answer.

Please share solve sumatory ecuation

cause the recursion is a bad guy :)

Your solution is not recursive!