#include <stdio.h>
#include <stdbool.h>
#include <assert.h>
#include <math.h>

double mean(double set[], int set_n) {
  double sum = 0.0;
  for(int i=0; i<set_n; i++) {
    sum += set[i];
  }

  return sum/set_n;
}

bool isalmost(double x, double c, double epsilon) {
  assert(epsilon >= 0.0);
  return fabs(x-c) < epsilon;
}

int main() {
  // Some data
  double d[] = {7, 8, 5, 1, 6, 2};
  const int d_n = 6;

  double e[] = {-10, 0, 10, 11, 12, 13, 14, 8, 9, 10, 11, 10, 10};
  const int e_n = 13;

  // Some tests
  assert(isalmost(mean(d, d_n), 4.833, 0.001));
  assert(isalmost(mean(e, e_n), 8.307, 0.001));

  // XXX assert(isalmost(median(d, d_n), 5.5, 0.001));
  // XXX assert(isalmost(median(e, e_n), XXX, 0.001));
  // XXX Variance
  // XXX Stddev
  // XXX Range
  // XXX Mode
  // XXX Percentile
}