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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。
本文档系腾讯云开发者社区成员共同维护，如有问题请联系 cloudcommunity@tencent.com
