NAME

std::numeric_limits::digits - std::numeric_limits::digits

Synopsis

static const int digits; (until C++11)
static constexpr int digits; (since C++11)

The value of std::numeric_limits<T>::digits is the number of digits in base-radix
that can be represented by the type T without change. For integer types, this is the
number of bits not counting the sign bit and the padding bits (if any). For
floating-point types, this is the digits of the mantissa (for IEC 559/IEEE 754
implementations, this is the number of digits stored for the mantissa plus one,
because the mantissa has an implicit leading 1 and binary point).

Standard specializations

T value of std::numeric_limits<T>::digits (assuming no
padding bits)
/* non-specialized */ 0
bool 1
char CHAR_BIT - std::numeric_limits<char>::is_signed
signed char CHAR_BIT - 1
unsigned char CHAR_BIT
wchar_t CHAR_BIT*sizeof(wchar_t) -
std::numeric_limits<wchar_t>::is_signed
char8_t (C++20) CHAR_BIT
char16_t (C++11) CHAR_BIT*sizeof(char16_t)
char32_t (C++11) CHAR_BIT*sizeof(char32_t)
short CHAR_BIT*sizeof(short)-1
unsigned short CHAR_BIT*sizeof(short)
int CHAR_BIT*sizeof(int)-1
unsigned int CHAR_BIT*sizeof(int)
long CHAR_BIT*sizeof(long)-1
unsigned long CHAR_BIT*sizeof(long)
long long (C++11) CHAR_BIT*sizeof(long long)-1
unsigned long long (C++11) CHAR_BIT*sizeof(long long)
float FLT_MANT_DIG
double DBL_MANT_DIG
long double LDBL_MANT_DIG

See also

radix the radix or integer base used by the representation of the given type
[static] (public static member constant)
min_exponent one more than the smallest negative power of the radix that is a valid
[static] normalized floating-point value
(public static member constant)
max_exponent one more than the largest integer power of the radix that is a valid
[static] finite floating-point value
(public static member constant)