limits.h

Defines maximum and minimum values that integral data types may contain.

This header file defines macros that describe the maximum and minimum values that objects with integral data types may accurately represent. Assigning values beyond the range of these limits will give undefined results at runtime.

The limits.h header file does not define macros to describe the minimum values for unsigned data types. The minimum value of an unsigned data type is always 0. The table below lists the preprocessor macros that define replacements for operators that use characters that are not available in some character sets.

Table 1. Integral Limits
Macro	Value
`CHAR_BIT`	Number of bits in the smallest data type that is not a bit field.
`CHAR_MAX, CHAR_MIN`	Maximum and minimum values, respectively, for `char`.
`SCHAR_MAX, SCHAR_MIN`	Maximum and minimum values, respectively, for `signed char`.
`UCHAR_MAX`	Maximum value for `unsigned char`.
`SHRT_MAX, SHRT_MIN`	Maximum and minimum values, respectively, for `short int`.
`USHRT_MAX`	Maximum value for `unsigned short int`.
`INT_MAX, INT_MIN`	Maximum and minimum values, respectively, for `int`.
`UINT_MAX`	Maximum value for `unsigned int.`
`LONG_MAX, LONG_MIN`	Maximum and minimum values, respectively, for `long int`.
`ULONG_MA`	Maximum value for `unsigned long int`.
`MB_LEN_MAX`	Maximum number of bytes in a multibyte character.
`LLONG_MAX, LLONG_MIN`	Maximum and minimum values, respectively, for `long long int`. This facility is not part of the ISO/IEC standard for C. It is an EWL extension of the C Standard Library.
`ULLONG_MAX`	Maximum value for `unsignedlong long int`. This facility is not part of the ISO/IEC standard for C. It is an EWL extension of the C Standard Library.