Do you want to make sure that Mercury is prograde before executing your code?
Or maybe you don't want your demo program to be used in production?
Either way, Fool Moon is the library for you!
#include <foolmoon.h>
int main()
{
if (is_mercury_retrograde())
{
printf("Mercury is retrograde\n");
printf("Critical failure!\n");
return 1;
}
///Your high quality code here:
do_some_mercury_dependent_job();
}