std::numeric_limits<T>:: min_exponent
|
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
r
n-1
, where
r
is
std::
numeric_limits
<
T
>
::
radix
, is a valid normalized value of the floating-point type
T
.
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 |
| 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_MIN_EXP |
| double | DBL_MIN_EXP |
| long double | LDBL_MIN_EXP |
Example
Demonstrates the relationships of
min_exponent
,
min_exponent10
,
min()
, and
radix
for the type
float
:
#include <iostream> #include <limits> int main() { std::cout << "min() = " << std::numeric_limits<float>::min() << '\n' << "min_exponent10 = " << std::numeric_limits<float>::min_exponent10 << '\n' << std::hexfloat << '\n' << "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
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) |