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)  |