int result;

    int fibo (int n){
      int result;

      if (n<0) return -1;
      switch (n){
        case 0 : return 0;
        case 1 : return 1;
        default: result = fibo(n-1) + fibo(n-2); 
                 return result;}
    }

    main(){
      int n;

      n = 5;
      result = fibo(n);
    }