// Program to copy a member of a structure to another array
#include <stdio.h>
#include <time.h>

struct Vector {
  double a, b, c, d, e, f, g, h;
};

int main()
{
  int i, k, n;
  Vector *vec;
  double *r;
  printf("Array size    Elapsed time [sec] \n");

  for (int k=1; k<=20; k++) {
    // Array size
    int n = k * 2000000;

    // Allocation
    r = new double[n];
    vec = new Vector[n];




    // Initialization
    for (i=0; i<n; i++) {
      vec[i].a = 1.0;
      vec[i].b = 1.0;
      vec[i].c = 1.0;
      vec[i].d = 1.0;
      vec[i].e = 1.0;
      vec[i].f = 1.0;
      vec[i].g = 1.0;
      vec[i].h = 1.0;
    }

    // Start time
    clock_t time0 = clock();

    // Main calculation: copy the member a to r
    for (i=0; i<n; i++)
      r[i] = vec[i].a;

    // Finish time
    clock_t time1 = clock();

    // Output time
    double time = (double)(time1-time0)/CLOCKS_PER_SEC;
    printf("%11d %15.7f\n",n, time);

    // Deallocation
    delete[] r;
    delete[] vec;



  }
  return 0;
}