/* Put this statement before main. */

#include <time.h>

/* Put these declaration statements at the beginning,
when you declare other local variables. */

clock_t starttime, endtime;
double elapsed;

/* This statement substitutes for Matlab’s tic. */

starttime = clock();

/* Do the work. When working with any timer, beware of
inaccuracies:

-- If the work takes too long (not an issue in this
assignment), the counter can roll over to zero (like
the odometer on an old car) and timing will be inaccurate.

-- If the work takes too little time, the "random" noise
in the count will be a large percentage of the measurement.

If necessary, do the work S times between the two calls
to clock, where S is chosen to make the difference in
starttime and endtime about CLOCKS_PER_SEC, and divide
elapsed by S.
*/

/* These two statements substitute for Matlab’s toc. */

endtime = clock();
elapsed = ((double) (endtime - starttime)) / CLOCKS_PER_SEC;

/* Reference: http://www.cs.utah.edu/dept/old/texinfo/glibc-manual-0.02/
library_19.html#SEC310 */