std::numeric_limits<T>::radix

 

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

The value of std::numeric_limits<T>::radix is the base of the number system used in the representation of the type. It is 2 for all binary numeric types, but it may be, for example, 10 for IEEE 754 decimal floating-point types or for third-party binary-coded decimal integers. This constant is meaningful for all specializations.

Standard specializations

T	value of std::numeric_limits<T>::radix
/* non-specialized */	​0​
bool	2
char	2
signed char	2
unsigned char	2
wchar_t	2
char8_t (since C++20)	2
char16_t (since C++11)	2
char32_t (since C++11)	2
short	2
unsigned short	2
int	2
unsigned int	2
long	2
unsigned long	2
long long (since C++11)	2
unsigned long long (since C++11)	2
float	FLT_RADIX
double	FLT_RADIX
long double	FLT_RADIX

See also

digits [static]	number of radix digits that can be represented without change (public static member constant)
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)
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)