std::numeric_limits::min_exponent
From cppreference.com
< cpp | types | numeric limits
static const int min_exponent;
|
(until C++11) | |
static constexpr int min_exponent;
|
(since C++11) | |
The value of std::numeric_limits<T>::min_exponent is the lowest negative number n
such that rn-1
, where r
is std::numeric_limits<T>::radix is a valid normalized value of the floating-point type T
.
[edit] Standard specializations
T
|
value of std::numeric_limits<T>::min_exponent |
/* non-specialized */ | 0 |
bool | 0 |
char | 0 |
signed char | 0 |
unsigned char | 0 |
wchar_t | 0 |
char16_t | 0 |
char32_t | 0 |
short | 0 |
unsigned short | 0 |
int | 0 |
unsigned int | 0 |
long | 0 |
unsigned long | 0 |
long long | 0 |
unsigned long long | 0 |
float | FLT_MIN_EXP |
double | DBL_MIN_EXP |
long double | LDBL_MIN_EXP |
[edit] Example
Demonstrates the relationships of min_exponent, min_exponent10, min, and radix for the type float:
Run this code
#include <iostream> int main() { std::cout << "min() = " << std::numeric_limits<float>::min() << '\n' << "min_exponent10 = " << std::numeric_limits<float>::min_exponent10 << '\n' << std::hexfloat << "min() = " << std::numeric_limits<float>::min() << '\n' << "min_exponent = " << std::numeric_limits<float>::min_exponent << '\n'; }
Output:
min() = 1.17549e-38 min_exponent10 = -37 min() = 0x1p-126 min_exponent = -125
[edit] See also
[static]
|
the radix or integer base used by the representation of the given type (public static member constant) |
[static]
|
the smallest negative power of ten that is a valid normalized floating-point value (public static member constant) |
[static]
|
one more than the largest integer power of the radix that is a valid finite 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) |