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

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

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).

[edit] Standard specializations [edit] See also the radix or integer base used by the representation of the given type
(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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