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Showing content from https://en.cppreference.com/w/cpp/language/../numeric/../types/numeric_limits/radix.html below:

std::numeric_limits<T>::radix - cppreference.com

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.

[edit] 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 [edit] See also number of radix digits that can be represented without change
(public static member constant) [edit] one more than the smallest negative power of the radix that is a valid normalized floating-point value
(public static member constant) [edit] 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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