std::numeric_limits::min_exponent
static const int min_exponent; | ? | (until C++11) |
---|---|---|
static constexpr int min_exponent; | ? | (since C++11) |
价值std::numeric_limits<T>::min_exponent
是最低的负数。n
使得Rn-1
,在哪里r
是std::numeric_limits<T>::radix
浮点类型的有效规范化值。T
...
标准专业化
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 |
例
演示min的关系[医]指数,最小[医]类型浮点数的指数10、min和基数:
二次
#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';
}
二次
产出:
二次
min() = 1.17549e-38
min_exponent10 = -37
min() = 0x1p-126
min_exponent = -125
二次
另见
radix static | the radix or integer base used by the representation of the given type (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) |
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) |
max_exponent10 static | the largest integer power of 10 that is a valid finite floating-point value (public static member constant) |
? cppreference.com
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