/* This program demonstrates that acos(x) is not portable across implementations. */

#include <cmath>
#include <iostream>
#include <cstdio>

int main()
{
  double x;
  int i;

  srand48(100);

  for (i = 0; i < 10000 ; i++) {
    x = 1 - drand48() * 2.0;
    printf("%.15lf\n", acos(x));
  }
  return 0;
}