std::numeric_limits::max_exponent10
static const int max_exponent10; | | (until C++11) |
|---|---|---|
static constexpr int max_exponent10; | | (since C++11) |
价值std::numeric_limits<T>::max_exponent10是最大正数。n使10n
是浮点类型的一个可表示的有限值。T...
标准专业化
T | value of std::numeric_limits<T>::max_exponent10 |
|---|---|
/* 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_MAX_10_EXP |
double | DBL_MAX_10_EXP |
long double | LDBL_MAX_10_EXP |
例
演示max的关系[医]指数，最大值[医]指数为10，类型浮点数为最大值%28%29：
二次
#include <iostream>
int main()
{
std::cout << "max() = " << std::numeric_limits<float>::max() << '\n'
<< "max_exponent10 = " << std::numeric_limits<float>::max_exponent10 << '\n'
<< std::hexfloat
<< "max() = " << std::numeric_limits<float>::max() << '\n'
<< "max_exponent = " << std::numeric_limits<float>::max_exponent << '\n';
}二次
产出：
二次
max() = 3.40282e+38
max_exponent10 = 38
max() = 0x1.fffffep+127
max_exponent = 128二次
另见
max_exponent static | one more than the largest integer power of the radix that is a valid finite floating-point value (public static member constant) |
|---|---|
min_exponent static | one more than the smallest negative power of the radix that is a valid normalized floating-point value (public static member constant) |
min_exponent10 static | the smallest negative power of ten that is a valid normalized floating-point value (public static member constant) |
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