CHAR_BIT
SCHAR_WIDTHSHRT_WIDTHINT_WIDTHLONG_WIDTHLLONG_WIDTH
(C23)(C23)(C23)(C23)(C23)
bit width of signed char, short, int, long, and long long respectivelySCHAR_MINSHRT_MININT_MINLONG_MINLLONG_MIN
(C99)
minimum value of signed char, short, int, long and long long respectivelySCHAR_MAXSHRT_MAXINT_MAXLONG_MAXLLONG_MAX
(C99)
maximum value of signed char, short, int, long and long long respectivelyUCHAR_WIDTHUSHRT_WIDTHUINT_WIDTHULONG_WIDTHULLONG_WIDTH
(C23)(C23)(C23)(C23)(C23)
bit width of unsigned char, unsigned short, unsigned int, unsigned long, and unsigned long long respectivelyUCHAR_MAXUSHRT_MAXUINT_MAXULONG_MAXULLONG_MAX
(C99)
maximum value of unsigned char, unsigned short, unsigned int,ULLONG_WIDTH
wint_t
wint_t
The types of these constants, other than CHAR_BIT and MB_LEN_MAX, are required to match the results of the integral promotions as applied to objects of the types they describe: CHAR_MAX may have type int or unsigned int, but never char. Similarly USHRT_MAX may not be of an unsigned type: its type may be int.
A freestanding implementation may lack sig_atomic_t and/or wint_t typedef names, in which case the SIG_ATOMIC_* and/or WINT_* macros are correspondingly absent.
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
int main(void)
{
printf("CHAR_BIT = %d\n", CHAR_BIT);
printf("MB_LEN_MAX = %d\n\n", MB_LEN_MAX);
printf("CHAR_MIN = %+d\n", CHAR_MIN);
printf("CHAR_MAX = %+d\n", CHAR_MAX);
printf("SCHAR_MIN = %+d\n", SCHAR_MIN);
printf("SCHAR_MAX = %+d\n", SCHAR_MAX);
printf("UCHAR_MAX = %u\n\n", UCHAR_MAX);
printf("SHRT_MIN = %+d\n", SHRT_MIN);
printf("SHRT_MAX = %+d\n", SHRT_MAX);
printf("USHRT_MAX = %u\n\n", USHRT_MAX);
printf("INT_MIN = %+d\n", INT_MIN);
printf("INT_MAX = %+d\n", INT_MAX);
printf("UINT_MAX = %u\n\n", UINT_MAX);
printf("LONG_MIN = %+ld\n", LONG_MIN);
printf("LONG_MAX = %+ld\n", LONG_MAX);
printf("ULONG_MAX = %lu\n\n", ULONG_MAX);
printf("LLONG_MIN = %+lld\n", LLONG_MIN);
printf("LLONG_MAX = %+lld\n", LLONG_MAX);
printf("ULLONG_MAX = %llu\n\n", ULLONG_MAX);
printf("PTRDIFF_MIN = %td\n", PTRDIFF_MIN);
printf("PTRDIFF_MAX = %+td\n", PTRDIFF_MAX);
printf("SIZE_MAX = %zu\n", SIZE_MAX);
printf("SIG_ATOMIC_MIN = %+jd\n",(intmax_t)SIG_ATOMIC_MIN);
printf("SIG_ATOMIC_MAX = %+jd\n",(intmax_t)SIG_ATOMIC_MAX);
printf("WCHAR_MIN = %+jd\n",(intmax_t)WCHAR_MIN);
printf("WCHAR_MAX = %+jd\n",(intmax_t)WCHAR_MAX);
printf("WINT_MIN = %jd\n", (intmax_t)WINT_MIN);
printf("WINT_MAX = %jd\n", (intmax_t)WINT_MAX);
}
Possible output:
CHAR_BIT = 8 MB_LEN_MAX = 16 CHAR_MIN = -128 CHAR_MAX = +127 SCHAR_MIN = -128 SCHAR_MAX = +127 UCHAR_MAX = 255 SHRT_MIN = -32768 SHRT_MAX = +32767 USHRT_MAX = 65535 INT_MIN = -2147483648 INT_MAX = +2147483647 UINT_MAX = 4294967295 LONG_MIN = -9223372036854775808 LONG_MAX = +9223372036854775807 ULONG_MAX = 18446744073709551615 LLONG_MIN = -9223372036854775808 LLONG_MAX = +9223372036854775807 ULLONG_MAX = 18446744073709551615 PTRDIFF_MIN = -9223372036854775808 PTRDIFF_MAX = +9223372036854775807 SIZE_MAX = 18446744073709551615 SIG_ATOMIC_MIN = -2147483648 SIG_ATOMIC_MAX = +2147483647 WCHAR_MIN = -2147483648 WCHAR_MAX = +2147483647 WINT_MIN = 0 WINT_MAX = 4294967295[edit] Limits of floating-point types the radix (integer base) used by the representation of all three floating-point types
DECIMAL_DIG digits and back to long double is the identity conversion: this is the decimal precision required to serialize/deserialize a long double
FLT_DECIMAL_DIGDBL_DECIMAL_DIGLDBL_DECIMAL_DIG
(C11)
conversion from float/double/long double to decimal with at leastFLT_DECIMAL_DIG/DBL_DECIMAL_DIG/LDBL_DECIMAL_DIG digits and back is the identity conversion: this is the decimal precision required to serialize/deserialize a floating-point value. Defined to at least 6, 10, and 10 respectively, or 9 for IEEE float and 17 for IEEE double (see also the C++ analog: max_digits10)
FLT_TRUE_MINDBL_TRUE_MINLDBL_TRUE_MIN
(C11)
minimum positive value of float, double and long double respectivelyFLT_EPSILONDBL_EPSILONLDBL_EPSILON
absolute value difference between 1.0 and the next representable value for float, double and long double respectivelydigits10 for detail)
FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG
number of base-FLT_RADIX digits that are in the floating-point mantissa and that can be represented without losing precision for float, double and long double respectively
FLT_MIN_EXPDBL_MIN_EXPLDBL_MIN_EXP
minimum negative integer such thatFLT_RADIX raised by power one less than that integer is a normalized float, double and long double respectively
FLT_MIN_10_EXPDBL_MIN_10_EXPLDBL_MIN_10_EXP
minimum negative integer such that 10 raised to that power is a normalized float, double and long double respectivelyFLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP
maximum positive integer such thatFLT_RADIX raised by power one less than that integer is a representable finite float, double and long double respectively
FLT_MAX_10_EXPDBL_MAX_10_EXPLDBL_MAX_10_EXP
maximum positive integer such that 10 raised to that power is a representable finite float, double and long double respectivelyFLT_HAS_SUBNORMDBL_HAS_SUBNORMLDBL_HAS_SUBNORM
(C11)(deprecated in C23)
whether the type supports subnormal (denormal) numbers:#include <float.h>
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("DECIMAL_DIG = %d\n", DECIMAL_DIG);
printf("FLT_DECIMAL_DIG = %d\n", FLT_DECIMAL_DIG);
printf("FLT_RADIX = %d\n", FLT_RADIX);
printf("FLT_MIN = %e\n", FLT_MIN);
printf("FLT_MAX = %e\n", FLT_MAX);
printf("FLT_EPSILON = %e\n", FLT_EPSILON);
printf("FLT_DIG = %d\n", FLT_DIG);
printf("FLT_MANT_DIG = %d\n", FLT_MANT_DIG);
printf("FLT_MIN_EXP = %d\n", FLT_MIN_EXP);
printf("FLT_MIN_10_EXP = %d\n", FLT_MIN_10_EXP);
printf("FLT_MAX_EXP = %d\n", FLT_MAX_EXP);
printf("FLT_MAX_10_EXP = %d\n", FLT_MAX_10_EXP);
printf("FLT_ROUNDS = %d\n", FLT_ROUNDS);
printf("FLT_EVAL_METHOD = %d\n", FLT_EVAL_METHOD);
printf("FLT_HAS_SUBNORM = %d\n", FLT_HAS_SUBNORM);
}
Possible output:
DECIMAL_DIG = 37 FLT_DECIMAL_DIG = 9 FLT_RADIX = 2 FLT_MIN = 1.175494e-38 FLT_MAX = 3.402823e+38 FLT_EPSILON = 1.192093e-07 FLT_DIG = 6 FLT_MANT_DIG = 24 FLT_MIN_EXP = -125 FLT_MIN_10_EXP = -37 FLT_MAX_EXP = 128 FLT_MAX_10_EXP = 38 FLT_ROUNDS = 1 FLT_EVAL_METHOD = 1 FLT_HAS_SUBNORM = 1[edit] References
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