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std::isnan

De cppreference.com
< cpp‎ | numeric‎ | math

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C++
 
Bibliothèque Numerics
Fonctions mathématiques courantes
Virgule flottante environnement
Nombres complexes
Tableaux numériques
La génération de nombres pseudo-aléatoires
Moment de la compilation arithmétique rationnelle (C++11)
Génériques des opérations numériques
Original:
Generic numeric operations
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iota (C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Fonctions mathématiques courantes
{{{1}}}
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{{{2}}}
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Fonctions
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Functions
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Opérations de base
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Basic operations
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remainder (C++11)
remquo (C++11)
fma (C++11)
fmax (C++11)
fmin (C++11)
fdim (C++11)
nan
nanf
nanl		 (C++11)
(C++11)
(C++11)
Les fonctions exponentielles
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Exponential functions
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exp
exp2 (C++11)
expm1 (C++11)
log
log10
log1p (C++11)
log2 (C++11)
Les fonctions de puissance
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Power functions
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sqrt
cbrt (C++11)
hypot (C++11)
pow
Les fonctions trigonométriques et hyperboliques
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Trigonometric and hyperbolic functions
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sinh
cosh
tanh
asinh (C++11)
acosh (C++11)
atanh (C++11)
{{{1}}}
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{{{2}}}
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Erreur fonctions et gamma
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Error and gamma functions
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erf (C++11)
erfc (C++11)
lgamma (C++11)
tgamma (C++11)
Entier le plus proche opérations en virgule flottante
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Nearest integer floating point operations
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ceil
floor
round
lround
llround		 (C++11)
(C++11)
(C++11)
trunc (C++11)
nearbyint (C++11)
rint
lrint
llrint		 (C++11)
(C++11)
(C++11)
Flottant fonctions de manipulation de points
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Floating point manipulation functions
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ldexp
scalbn
scalbln		 (C++11)
(C++11)
ilogb (C++11)
logb (C++11)
frexp
modf
nextafter
nexttoward		 (C++11)
(C++11)
copysign (C++11)
Classification / Comparaison
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Classification/Comparison
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fpclassify (C++11)
isfinite (C++11)
isinf (C++11)
isnan (C++11)
isnormal (C++11)
signbit (C++11)
isgreater (C++11)
isgreaterequal (C++11)
isless (C++11)
islessequal (C++11)
islessgreater (C++11)
isunordered (C++11)
Macro constantes
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Macro constants
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FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN		 (C++11)
(C++11)
(C++11)
(C++11)
(C++11)
</div>
 
</div>
Déclaré dans l'en-tête <cmath>
bool isnan( float arg );
 (depuis C++11)
bool isnan( double arg );
 (depuis C++11)
bool isnan( long double arg );
 (depuis C++11)
Détermine si la donnée arg flottante nombre à virgule n'est pas-a-number (NaN) .
Original:
Determines if the given floating point number arg is not-a-number (NaN).
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[modifier] Paramètres

arg -
valeur du point flottant
Original:
floating point value
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[modifier] Retourne la valeur

true si arg est NaN, false autrement
Original:
true if arg is NaN, false otherwise
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[modifier] Voir aussi

(C++11)
catégorise la valeur du point donné flottante
Original:
categorizes the given floating point value
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(fonction) [edit]
(C++11)
vérifie si le nombre donné a une valeur finie
Original:
checks if the given number has finite value
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(fonction) [edit]
(C++11)
vérifie si le nombre donné est infini
Original:
checks if the given number is infinite
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(fonction) [edit]
(C++11)
vérifie si le nombre donné est normal
Original:
checks if the given number is normal
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(fonction) [edit]
(C++11)
vérifie si deux valeurs à virgule flottante ne sont pas ordonnés
Original:
checks if two floating-point values are unordered
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(fonction) [edit]
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