NormalRandom

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
double nrand(void) {
  int i;
  double r = 0;
  for (i = 0; i < 12; i++) r += rand() / ((double) RAND_MAX + 1.0);
  return r - 6;
}
int compare_double(const void *p1, const void *p2) {
  return *(double *) p1 - *(double *) p2;
}
int main(void) {
  int i;
  const int n = 100;
  double v[n];
  srand((unsigned) time(NULL));
  for (i = 0; i < n; i++) v[i] = nrand() * 280 + 750;
  for (i = 0; i < n; i++) printf("%.1lf ", v[i]); puts("");
  qsort(v, n, sizeof(double), compare_double);
  for (i = 0; i < n; i++) printf("%.1lf ", v[i]); puts("");
  return 0;
}