std::numeric_limits<T>::max_exponent
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 \(\scriptsize r^{n-1}\)rn-1, where r is std::numeric_limits<T>::radix, is a representable finite value of the floating-point type T.
Standard specializations
T | value of std::numeric_limits<T>::max_exponent |
|---|---|
| /* non-specialized */ |
0 |
| bool |
0 |
| char |
0 |
| signedchar |
0 |
| unsignedchar |
0 |
| wchar_t |
0 |
| char8_t (since C++20) |
0 |
| char16_t (since C++11) |
0 |
| char32_t (since C++11) |
0 |
| short |
0 |
| unsignedshort |
0 |
| int |
0 |
| unsignedint |
0 |
| long |
0 |
| unsignedlong |
0 |
| longlong (since C++11) |
0 |
| unsignedlonglong (since C++11) |
0 |
| float |
FLT_MAX_EXP |
| double |
DBL_MAX_EXP |
| longdouble |
LDBL_MAX_EXP |
Example
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 << '\n'
<< "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
See also
|
[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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https://en.cppreference.com/cpp/types/numeric_limits/max_exponent
