Rekursif : Strange Result Calculating Series (Menghitung Hasil Deret Aneh)

Series is given as follows  :

How to find value? We can make use of recursive programs. Now we see a plus sign (+) min (-) it. How do I tell? Absolutely, which is worth an odd marked plus (+) and a marked positive value min (-). From these observations we can use it as a key telling the program making.

Now we make a recursive program :

Proses_rekursif(int n){

      if(n==0) return 0;

      else if(n==1) return 1;

      else if(n%2==0) return (-(1.0/n)+(proses2(n-1)));

      else return ((1.0/n)+(proses2(n-1)));

      }

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