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std::numeric_limits::max_exponent

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C++
 
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std::numeric_limits
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static const int max_exponent
 (fino al c++11)
static constexpr int max_exponent
 (dal C++11)
Il valore del std::numeric_limits<T>::max_exponent è il più grande numero positivo tale che n 10n-1
 è un valore rappresentabile finita del tipo a virgola mobile T.
Original:
The value of std::numeric_limits<T>::max_exponent is the largest positive number n such that 10n-1
 is a representable finite value of the floating-point type T.
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[modifica] Specializzazioni standard

T
valore di std::numeric_limits<T>::max_exponent
Original:
value of std::numeric_limits<T>::max_exponent
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/* 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

[modifica] Esempio

Vengono illustrate le relazioni di max_exponent, max_exponent10, e max () per il tipo float:
Original:
Demonstrates the relationships of max_exponent, max_exponent10, and max() for the type float:
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#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

[modifica] Vedi anche

[statico]
la più piccola potenza negativa di dieci, che è un valido normalizzato valore a virgola mobile
Original:
the smallest negative power of ten that is a valid normalized floating-point value
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(pubblico membro statico costante) [modifica]
[statico]
oltre la più piccola potenza negativa della radice che è una valida virgola mobile normalizzato valore uno
Original:
one more than the smallest negative power of the radix that is a valid normalized floating-point value
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(pubblico membro statico costante) [modifica]
[statico]
la più grande potenza intera di 10 che è un valido finita valore a virgola mobile
Original:
the largest integer power of 10 that is a valid finite floating-point value
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(pubblico membro statico costante) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/types/numeric_limits/max_exponent&oldid=27084"