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.
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 |
Demonstrates the relationships of min_exponent, min_exponent10, min, and radix for the type float:
#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
|
[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) |
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