std::numeric_limits<T>::max_exponent
From cppreference.com
< cpp | types | numeric limits
static const int max_exponent; |
(until C++11) | |
| static constexpr int max_exponent; |
(since C++11) | |
The value of std::numeric_limits<T>::max_exponent is the largest positive number n such that rn-1
, where r is std::numeric_limits<T>::radix, is a representable finite value of the floating-point type T.
[edit] Standard specializations
T
|
value of std::numeric_limits<T>::max_exponent |
| /* non-specialized */ | 0 |
| bool | 0 |
| char | 0 |
| signed char | 0 |
| unsigned char | 0 |
| wchar_t | 0 |
| char8_t (since C++20) | 0 |
| char16_t (since C++11) | 0 |
| char32_t (since C++11) | 0 |
| short | 0 |
| unsigned short | 0 |
| int | 0 |
| unsigned int | 0 |
| long | 0 |
| unsigned long | 0 |
| long long (since C++11) | 0 |
| unsigned long long (since C++11) | 0 |
| float | FLT_MAX_EXP |
| double | DBL_MAX_EXP |
| long double | LDBL_MAX_EXP |
[edit] Example
Demonstrates the relationships of max_exponent, max_exponent10, and max() for the type float:
Run this code
#include <iostream> #include <limits> int main() { std::cout << "max() = " << std::numeric_limits<float>::max() << '\n' << "max_exponent10 = " << std::numeric_limits<float>::max_exponent10 << '\n' << std::hexfloat << '\n' << "max() = " << std::numeric_limits<float>::max() << '\n' << "max_exponent = " << std::numeric_limits<float>::max_exponent << '\n'; }
Output:
max() = 3.40282e+38 max_exponent10 = 38 max() = 0x1.fffffep+127 max_exponent = 128
[edit] See also
| [static] |
the smallest negative power of ten that is a valid normalized floating-point value (public static member constant) |
| [static] |
one more than the smallest negative power of the radix that is a valid normalized floating-point value (public static member constant) |
| [static] |
the largest integer power of 10 that is a valid finite floating-point value (public static member constant) |
