# std::numeric_limits::radix

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< cpp‎ | types‎ | numeric limits

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
char16_t | 2
char32_t | 2
short | 2
unsigned short | 2
int | 2
unsigned int | 2
long | 2
unsigned long | 2
long long | 2
unsigned long long | 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)

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