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libc - limits header
June 26, 2023
Definition of limits of standard data types.
Limits for floating-point types are defined in <float.h>.
Limits for width-specific integral types and other typedefs are defined in <stdint.h>.
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Macro definitions
Please note - all these definitions are implementation/platform dependent. These values are true for x32/x64 platform.
| name | expression | 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 |