std::numeric_limits<T>::max_exponent10
static const int max_exponent10; |
(until C++11) | |
static constexpr int max_exponent10; |
(since C++11) |
The value of std::numeric_limits<T>::max_exponent10
is the largest positive number n
such that \(\scriptsize 10^n\)10n
is a representable finite value of the floating-point type T
.
Standard specializations
T |
value of std::numeric_limits<T>::max_exponent10 |
---|---|
/* non-specialized */ | 0 |
bool |
0 |
char |
0 |
signed char |
0 |
unsigned char |
0 |
wchar_t |
0 |
char8_t (C++20) |
0 |
char16_t (C++11) |
0 |
char32_t (C++11) |
0 |
short |
0 |
unsigned short |
0 |
int |
0 |
unsigned int |
0 |
long |
0 |
unsigned long |
0 |
long long (C++11) |
0 |
unsigned long long (C++11) |
0 |
float |
FLT_MAX_10_EXP |
double |
DBL_MAX_10_EXP |
long double |
LDBL_MAX_10_EXP |
Example
Demonstrates the relationships of max_exponent
, max_exponent10
, and max()
for the type float
:
#include <iostream> 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
See also
[static]
|
one more than the largest integer power of the radix that is a valid finite 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 smallest negative power of ten that is a valid normalized floating-point value (public static member constant) |
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