AcadEx: Heuristic Approach to Birthday Problem - ITA

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#define EXPMAX 1000000
#define NMAX 365
#define NMIN 2

int fillDate(int*,int);
int getInt(char*,int,int);

int main () {
  srand48(time(0));
  int N, date[NMAX], i, freq, EXP;
  long double prob;
  N = getInt("N persone",NMIN,NMAX);
  EXP = getInt("N esperimenti",1,EXPMAX);
  freq=0;
  for (i=0;i<EXP;i++) {
    freq+= fillDate(date,N);
  }
  prob= freq*100./EXP;
  printf("Percentuale di probabilità: %Lf\n",prob);
  return 0;
}

int getInt(char*mess,int min,int max) {
  int out;
  do {
    printf("%s [%d,%d]: ",mess,min,max);
    scanf("%d",&out);
  }while(out<min||out>max);
  return out;
}

int fillDate(int*array,int len) {
  int i, j;
  for (i=0;i<len;i++) {
    *(array+i) = lrand48()%(NMAX-1);
    for (j=0;j<i;j++) {
      if (*(array+j)==*(array+i)) return 1;
    }
  }
  return 0;
}