#include <stdio.h>
#include <stdlib.h>
#include <math.h>

float suma(float tab[], int dlugosc) {
  int i = 0, s = 0;
  for (i = 0; i < dlugosc; i++)
    s += tab[i];

  return s;
}

float sredniaA(float tab[], int dlugosc) {
  int i = 0, s = 0, sr;
  for (i = 0; i < dlugosc; i++)
    s += tab[i];

  sr = s / (i + 1);
  return sr;
}

float sredniaG(float tab[], int dlugosc) {
  int i = 0;
  float sr;
  long long int s = 1.0;
  for (i = 0; i < dlugosc; i++)
    s = s * tab[i];
  sr = pow(s, (1.0 / (i + 1)));
  return sr;
}

int main() {
  int i = 0, rozmiar = 4, wpisane = 0;
  float *tablica, a;

  tablica = (float*)malloc(rozmiar * sizeof(*tablica));
  tablica[0] = 0.1;

  FILE* f = fopen("dane.txt", "r");

  if (f == NULL)
    printf("Problem z plikiem");

  else {
    if (wpisane != rozmiar) {
      while (!feof(f)) {
        if (i == 0) {
          fscanf(f, "%f", &a);
          tablica[i] = a;
          i++;
        } else {
          fscanf(f, "%f", &a);
          tablica[i] = a;
          i++;
        }
      }
    }

    else {
      float* tablica2 = (float*)malloc(2 * rozmiar * sizeof(*tablica));
      rozmiar = 2 * rozmiar;
      int j;
      for (j = 0; j < i; j++)
        tablica2[j] = tablica[j];
      free(tablica);
      tablica = tablica2;
      i--;
      tablica[i] = a;
      i++;
      wpisane++;
    }
  }

  int j = 0;
  for (j = 0; j < i - 1; j++)
    printf("%.3f\n", tablica[j]);

  printf("%.3f\n", suma(tablica, (i)));
  printf("%.3f\n", sredniaA(tablica, (i)));
  printf("%.3f\n", sredniaG(tablica, (i)));

  return 0;
}