#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
  int i,j;
  int n = 10000, m = 100000;
  double C1 = -0.1666666666666666;    // =1/6
  double C2 =  0.8333333333333333e-2; // =1/120
  double C3 = -0.1984126984126984e-3; // =1/5040
  double C4 =  2.7557319223985890e-6; // =1/362880

  // Initialization
  double *x = new double[n];
  double *y = new double[n];
  for (i=0; i<n; i++) x[i] = (double)rand()/RAND_MAX;

  // Start time
  clock_t time0 = clock();

  // Main calculation
  for (j=0; j<m; j++)
    for (i=0; i<n; i++)
      y[i] = x[i] + C1*x[i]*x[i]*x[i] + C2*x[i]*x[i]*x[i]*x[i]*x[i]
	+ C3*x[i]*x[i]*x[i]*x[i]*x[i]*x[i]*x[i]
	+ C4*x[i]*x[i]*x[i]*x[i]*x[i]*x[i]*x[i]*x[i]*x[i];
  // Finish time
  clock_t time1 = clock();

  // Output time
  double time = (double)(time1-time0)/CLOCKS_PER_SEC;
  printf("Time = %15.7f sec\n", time);

  delete[] x;
  delete[] y;
  return 0;
}