uso dei limiti per variabili numeriche

da guardare il resto dei limiti dentro limits.h o limits, 

riferimento:

http://stackoverflow.com/questions/15889253/maximum-value-for-unsigned-int

C

#include <limits.h>
unsigned int max_unsigned_int_size = UINT_MAX;

C++

#include <limits>
unsigned int max_unsigned_int_size = std::numeric_limits<unsigned int>::max();