std::numeric_limits::lowest – cppreference.com
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(seit C++11) | |
Gibt den niedrigsten endlichen Wert darstellbar durch die numerischen Typ T, also einen endlichen Wert x, so dass es keinen anderen endlichen Wert y wo y < x. Dies unterscheidet sich von std::numeric_limits<T>::min() für Fließkomma-Typen. Nur sinnvoll für beschränkte Typen .
Original:
Returns the lowest finite value representable by the numeric type T, that is, a finite value x such that there is no other finite value y where y < x. This is different from std::numeric_limits<T>::min() for floating-point types. Only meaningful for bounded types.
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Rückgabewert
T
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std::numeric_limits<T>::lowest()
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| /* non-specialized */ | T();
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bool
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false
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char
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CHAR_MIN |
signed char
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SCHAR_MIN |
unsigned char
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0
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wchar_t
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WCHAR_MIN |
char16_t
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0
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char32_t
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0
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short
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SHRT_MIN |
unsigned short
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0
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int
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INT_MIN |
unsigned int
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0
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long
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LONG_MIN |
unsigned long
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0
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long long
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LLONG_MIN |
unsigned long long
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0
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float
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-FLT_MAX
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double
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-DBL_MAX
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long double
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-LDBL_MAX
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Notes
Es ist zwar nicht für eine grundlegende C + + floating-poing Typen, ein Drittanbieter-Fließkomma-Typ T so dass std::numeric_limits<T>::lowest() != -std::numeric_limits<T>::max() existieren kann .. wahren
Original:
While it's not true for fundamental C++ floating-poing types, a third-party floating-point type T may exist such that std::numeric_limits<T>::lowest() != -std::numeric_limits<T>::max().
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Ausnahmen
Beispiel
Demonstriert, min, max, und am niedrigsten bei Floating-Point-Typen
Original:
Demonstrates min, max, and lowest for floating-point types
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#include <limits> #include <iostream> int main() { std::cout << "std::numeric_limits<T>::min():\n" << "\tfloat: " << std::numeric_limits<float>::min() << " or " << std::hexfloat << std::numeric_limits<float>::min() << '\n' << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::min() << " or " << std::hexfloat << std::numeric_limits<double>::min() << '\n'; std::cout << "std::numeric_limits<T>::lowest():\n" << "\tfloat: " << std::defaultfloat << std::numeric_limits<float>::lowest() << " or " << std::hexfloat << std::numeric_limits<float>::lowest() << '\n' << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::lowest() << " or " << std::hexfloat << std::numeric_limits<double>::lowest() << '\n'; std::cout << "std::numeric_limits<T>::max():\n" << "\tfloat: " << std::defaultfloat << std::numeric_limits<float>::max() << " or " << std::hexfloat << std::numeric_limits<float>::max() << '\n' << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::max() << " or " << std::hexfloat << std::numeric_limits<double>::max() << '\n'; }
Output:
std::numeric_limits<T>::min():
float: 1.17549e-38 or 0x1p-126
double: 2.22507e-308 or 0x1p-1022
std::numeric_limits<T>::lowest():
float: -3.40282e+38 or -0x1.fffffep+127
double: -1.79769e+308 or -0x1.fffffffffffffp+1023
std::numeric_limits<T>::max():
float: 3.40282e+38 or 0x1.fffffep+127
double: 1.79769e+308 or 0x1.fffffffffffffp+1023
Siehe auch
[statisch] |
gibt den kleinsten endlichen Wert des angegebenen Typs Original: returns the smallest finite value of the given type The text has been machine-translated via Google Translate. (public static Elementfunktion) [edit] |
[statisch] |
gibt die kleinste positive subnormal Wert der gegebenen Fließkomma-Typ Original: returns the smallest positive subnormal value of the given floating-point type The text has been machine-translated via Google Translate. (public static Elementfunktion) [edit] |
[statisch] |
liefert den größten endlichen Wert des angegebenen Typs Original: returns the largest finite value of the given type The text has been machine-translated via Google Translate. (public static Elementfunktion) [edit] |