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# std::numeric_limits::digits

From cppreference.com
< cpp‎ | types‎ | numeric limits

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 number of digits in the mantissa.

### [edit] 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
char16_t | CHAR_BIT*sizeof(char16_t)
char32_t | 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 | CHAR_BIT*sizeof(long long)-1
unsigned long long | CHAR_BIT*sizeof(long long)
float | FLT_MANT_DIG
double | DBL_MANT_DIG
long double | LDBL_MANT_DIG

### [edit] See also

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

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