Uncompleted program 🐢

Question

Find the sum of the n-elements of the series 1, -0.5, 0.25, -0.125, ...

I tried
#include <stdio. h>
int main ()
{
int n;
int sum = 0;
for (i=0; i<n;i++)
{
sum+ = a;
a = -a/2;
but I couldn't complete it my mind is off
and how can I write this using an array!

Answer 1

you have to introduce sum and a as a float datatype and also introduce i as an int datatype. You also missed commands for reading the value of n and printing the value of sum

Answer 2

oops yes about the float 😅
and yes I know about the input and output but this is a just a view of what I am trying to do... and still lost literally my mind isn't working