<climits> (limits.h)

Sizes of integral types

This header defines constants with the limits of fundamental integral types for the specific system and compiler implementation used.

The limits for fundamental floating-point types are defined in <cfloat> (<float.h>).
The limits for width-specific integral types and other typedef types are defined in <cstdint> (<stdint.h>).

Macro constants

name	expresses	possible value*
`CHAR_BIT`	Number of bits in a `char` object (byte)	`8` or greater*
`SCHAR_MIN`	Minimum value for an object of type `signed char`	`-127` (`-2⁷+1`) or less*
`SCHAR_MAX`	Maximum value for an object of type `signed char`	`127` (`2⁷-1`) or greater*
`UCHAR_MAX`	Maximum value for an object of type `unsigned char`	`255` (`2⁸-1`) or greater*
`CHAR_MIN`	Minimum value for an object of type `char`	either `SCHAR_MIN` or `0`
`CHAR_MAX`	Maximum value for an object of type `char`	either `SCHAR_MAX` or `UCHAR_MAX`
`MB_LEN_MAX`	Maximum number of bytes in a multibyte character, for any locale	`1` or greater*
`SHRT_MIN`	Minimum value for an object of type `short int`	`-32767` (`-2¹⁵+1`) or less*
`SHRT_MAX`	Maximum value for an object of type `short int`	`32767` (`2¹⁵-1`) or greater*
`USHRT_MAX`	Maximum value for an object of type `unsigned short int`	`65535` (`2¹⁶-1`) or greater*
`INT_MIN`	Minimum value for an object of type `int`	`-32767` (`-2¹⁵+1`) or less*
`INT_MAX`	Maximum value for an object of type `int`	`32767` (`2¹⁵-1`) or greater*
`UINT_MAX`	Maximum value for an object of type `unsigned int`	`65535` (`2¹⁶-1`) or greater*
`LONG_MIN`	Minimum value for an object of type `long int`	`-2147483647` (`-2³¹+1`) or less*
`LONG_MAX`	Maximum value for an object of type `long int`	`2147483647` (`2³¹-1`) or greater*
`ULONG_MAX`	Maximum value for an object of type `unsigned long int`	`4294967295` (`2³²-1`) or greater*
`LLONG_MIN`	Minimum value for an object of type `long long int`	`-9223372036854775807` (`-2⁶³+1`) or less*
`LLONG_MAX`	Maximum value for an object of type `long long int`	`9223372036854775807` (`2⁶³-1`) or greater*
`ULLONG_MAX`	Maximum value for an object of type `unsigned long long int`	`18446744073709551615` (`2⁶⁴-1`) or greater*

* the actual value depends on the particular system and library implementation, but shall reflect the limits of these types in the target platform.

Compatibility

LLONG_MIN, LLONG_MAX and ULLONG_MAX are defined for libraries complying with the C standard of 1999 or later (which only includes the C++ standard since 2011: C++11).

C++

Reference

C library:

Containers:

Input/Output:

Multi-threading:

Other:

<climits> (limits.h)

Macro constants

Compatibility

See also