AcadEx: Sample Deviation and Confidence Interval - ITA

#include <stdio.h>
#include <math.h>
#define MAX_N 1000

void getDati(long double*,int);
long double mediaCamp(long double*,int);
long double devStd(long double*,long double,int);

int main () {
  long double dati[MAX_N], med, dev, unc;
  int n;
  do {
    printf("Numero dati [0,%d]: ",MAX_N);
    scanf("%d",&n);
  } while (n<0 || n>MAX_N);
  getDati(dati,n);
  med = mediaCamp(dati,n);
  dev = devStd(dati,med,n);
  unc = dev/sqrt(n);
  printf("Media campionaria: %Lf\n",med);
  printf("Deviazione standard campionaria: %Lf\n",dev);
  printf("Valore al 68percento: %Lf (+-)%Lf\n",med,unc);
  printf("Valore al 99percento: %Lf (+-)%Lf\n",med,3*unc);
  return 0;
}

void getDati (long double*array,int len) {
  int i;
  for (i=0;i<len;i++) {
    printf("Inserisci valore %d: ",i+1);
    scanf("%Lf",array+i);
  }
}


long double mediaCamp (long double*array,int len) {
  int i;
  long double out=0;
  for (i=0;i<len;i++) {
    out+= *(array+i);
  }
  return out/len;
}

long double devStd (long double*array,long double in, int len) {
  int i;
  long double out=0;
  for (i=0;i<len;i++) {
    out+= pow(array[i]-in,2);
  }
  return sqrt(out/(len-1));
}