`<limits.h>`

Include the standard header <limits.h> to determine various properties of the integer type representations. The standard header <limits.h> is available even in a freestanding implementation.

You can test the values of all these macros in an if directive. (The macros are #if expressions.)

#define CHAR_BIT <#if expression >= 8>
#define CHAR_MAX <#if expression >= 127>
#define CHAR_MIN <#if expression <= 0>
#define SCHAR_MAX <#if expression >= 127>
#define SCHAR_MIN <#if expression <= -127>
#define UCHAR_MAX <#if expression >= 255>
#define MB_LEN_MAX <#if expression >= 1>

#define SHRT_MAX <#if expression >= 32,767>
#define SHRT_MIN <#if expression <= -32,767>
#define USHRT_MAX <#if expression >= 65,535>

#define INT_MAX <#if expression >= 32,767>
#define INT_MIN <#if expression <= -32,767>
#define UINT_MAX <#if expression >= 65,535>

#define LONG_MAX <#if expression >= 2,147,483,647>
#define LONG_MIN <#if expression <= -2,147,483,647>
#define ULONG_MAX <#if expression >= 4,294,967,295>

#define LLONG_MAX <#if expression >= 9,223,372,036,854,775,807> [added with C99]
#define LLONG_MIN <#if expression <= -9,223,372,036,854,775,807> [added with C99]
#define ULLONG_MAX <#if expression >= 18,446,744,073,709,551,616> [added with C99]

`CHAR_BIT`

#define CHAR_BIT <#if expression >= 8>

The macro yields the maximum value for the number of bits used to represent an object of type char.

`CHAR_MAX`

#define CHAR_MAX <#if expression >= 127>

The macro yields the maximum value for type char. Its value is:

SCHAR_MAX if char represents negative values
UCHAR_MAX otherwise

`CHAR_MIN`

#define CHAR_MIN <#if expression <= 0>

The macro yields the minimum value for type char. Its value is:

SCHAR_MIN if char represents negative values
zero otherwise

`INT_MAX`

#define INT_MAX <#if expression >= 32,767>

The macro yields the maximum value for type int.

`INT_MIN`

#define INT_MIN <#if expression <= -32,767>

The macro yields the minimum value for type int.

`LLONG_MAX`

#define LLONG_MAX <#if expression >= 9,223,372,036,854,775,807> [added with C99]

The macro yields the maximum value for type long long.

`LLONG_MIN`

#define LLONG_MIN <#if expression <= -9,223,372,036,854,775,807> [added with C99]

The macro yields the minimum value for type long long.

`LONG_MAX`

#define LONG_MAX <#if expression >= 2,147,483,647>

The macro yields the maximum value for type long.

`LONG_MIN`

#define LONG_MIN <#if expression <= -2,147,483,647>

The macro yields the minimum value for type long.

`MB_LEN_MAX`

#define MB_LEN_MAX <#if expression >= 1>

The macro yields the maximum number of characters that constitute a multibyte character in any supported locale. Its value is >= MB_CUR_MAX.

`SCHAR_MAX`

#define SCHAR_MAX <#if expression >= 127>

The macro yields the maximum value for type signed char.

`SCHAR_MIN`

#define SCHAR_MIN <#if expression <= -127>

The macro yields the minimum value for type signed char.

`SHRT_MAX`

#define SHRT_MAX <#if expression >= 32,767>

The macro yields the maximum value for type short.

`SHRT_MIN`

#define SHRT_MIN <#if expression <= -32,767>

The macro yields the minimum value for type short.

`UCHAR_MAX`

#define UCHAR_MAX <#if expression >= 255>

The macro yields the maximum value for type unsigned char.

`UINT_MAX`

#define UINT_MAX <#if expression >= 65,535>

The macro yields the maximum value for type unsigned int.

`ULLONG_MAX`

#define ULLONG_MAX <#if expression >= 18,446,744,073,709,551,616> [added with C99]

The macro yields the maximum value for type unsigned long long.

`ULONG_MAX`

#define ULONG_MAX <#if expression >= 4,294,967,295>

The macro yields the maximum value for type unsigned long.

`USHRT_MAX`

#define USHRT_MAX <#if expression >= 65,535>

The macro yields the maximum value for type unsigned short.

See also the Table of Contents and the Index.