Consider the following C code that measures the execution time of a function:

#include

#include

void functionToBeTimed$()\{$

$//$ Code to be timed

int count $=0$;

for $($int i $=0$; i $<1000000$; $++$i$)\{$

count$++$;

$\}$

$\}$

int main$()\{$

struct timeval start$\_$time, end$\_$time;

double execution$\_$time;

$//$ Measure execution time

gettimeofday$($&start$\_$time, NULL$)$; $//$ Start timing

functionToBeTimed$()$;

gettimeofday$($&end$\_$time, NULL$)$; $//$ Stop timing

$//$ Calculate execution time in seconds

execution$\_$time $=($end$\_$time.tv$\_$sec $-$ start$\_$time.tv$\_$sec$)+$

$($end$\_$time.tv$\_$usec $-$ start$\_$time.tv$\_$usec$)/1000000\mathrm{.}0$;

printf$("$Execution Time: $\%$f seconds

$",$ execution$\_$time$)$;

return $0$;

$\}$

What is the purpose of the gettimeofday calls in this code?