For the date:     __DATE__
For the file:     __FILE__
For the line:     __LINE__
For the time:     __TIME__

#include <limits.h>
Biggest char:     CHAR_MAX
Smallest char:    CHAR_MIN
Smallest long:    LONG_MIN

#include <float.h>
Biggest double:   DBL_MAX
Tinyest double:   DBL_MIN