Standard library header <climits>
From cppreference.com
                    
                                        
                    
                    
                                                            
                    This header was originally in the C standard library as <limits.h>.
This header is part of the type support library, in particular it's part of the C numeric limits interface.
[edit] Macros
| CHAR_BIT | number of bits in byte (macro constant) | 
| MB_LEN_MAX | maximum number of bytes in a multibyte character (macro constant) | 
| CHAR_MIN | minimum value of char (macro constant) | 
| CHAR_MAX | maximum value of char (macro constant) | 
| SCHAR_MIN SHRT_MIN INT_MIN LONG_MIN LLONG_MIN (C++11) | minimum value of signed char, short, int, long and long long respectively (macro constant) | 
| SCHAR_MAX SHRT_MAX INT_MAX LONG_MAX LLONG_MAX (C++11) | maximum value of signed char, short, int, long and long long respectively (macro constant) | 
| UCHAR_MAX USHRT_MAX UINT_MAX ULONG_MAX ULLONG_MAX (C++11) | maximum value of unsigned char, unsigned short, unsigned int, unsigned long and unsigned long long respectively (macro constant) | 


