#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
int main()
{
  int i,j;
  int n = 10000, m = 1000;

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

  // Start time
  clock_t time0 = clock();

  // Main calculation
  for (j=0; j<m; j++)
    for (i=0; i<n; i++) {
      double d = r[i] * cos(theta[i]);
      x[i] = d * cos(phi[i]);
      y[i] = d * sin(phi[i]);
      z[i] = r[i] * sin(theta[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[] r;
  delete[] theta;
  delete[] phi;
  delete[] x;
  delete[] y;
  delete[] z;
  return 0;
}