static const int max_exponent; | (until C++11) | |
static constexpr int max_exponent; | (since C++11) |
The value of std::numeric_limits<T>::max_exponent is the largest positive number n such that 2n-1
is a representable finite value of the floating-point type T.
T | value of std::numeric_limits<T>::max_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_MAX_EXP |
double | DBL_MAX_EXP |
long double | LDBL_MAX_EXP |
Demonstrates the relationships of max_exponent, max_exponent10, and max() for the type float:
#include <iostream>
#include <limits>
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';
}Output:
max() = 3.40282e+38 max_exponent10 = 38 max() = 0x1.fffffep+127 max_exponent = 128
| [static]
| the smallest negative power of ten that is a valid normalized floating-point value (public static member constant) |
| [static]
| one more than the smallest negative power of the radix that is a valid normalized 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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