std::numeric_limits::min_exponent(3) | C++ Standard Libary | std::numeric_limits::min_exponent(3) |
NAME¶
std::numeric_limits::min_exponent - std::numeric_limits::min_exponent
Synopsis¶
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 \(\scriptsize r^{n-1}\)rn-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:
// Run this code
#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¶
radix the radix or integer base used by the representation of the
given
[static] type
(public static member constant)
min_exponent10 the smallest negative power of ten that is a valid normalized
[static] floating-point value
(public static member constant)
max_exponent one more than the largest integer power of the radix that is a
valid
[static] finite floating-point value
(public static member constant)
max_exponent10 the largest integer power of 10 that is a valid finite
floating-point
[static] value
(public static member constant)
2024.06.10 | http://cppreference.com |