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std::rand

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< cpp‎ | numeric‎ | random

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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
 
La génération de nombres pseudo-aléatoires
Les moteurs et les adaptateurs de moteur
Original:
Engines and engine adaptors
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linear_congruential_engine (C++11)
mersenne_twister_engine (C++11)
subtract_with_carry_engine (C++11)
discard_block_engine (C++11)
independent_bits_engine (C++11)
shuffle_order_engine (C++11)
Générateurs
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Generators
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random_device (C++11)
Les distributions
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Distributions
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Distributions uniformes
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Uniform distributions
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uniform_int_distribution (C++11)
uniform_real_distribution (C++11)
generate_canonical (C++11)
Distributions de Bernoulli
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Bernoulli distributions
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bernoulli_distribution (C++11)
binomial_distribution (C++11)
negative_binomial_distribution (C++11)
geometric_distribution (C++11)
Distributions de Poisson
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Poisson distributions
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poisson_distribution (C++11)
exponential_distribution (C++11)
gamma_distribution (C++11)
weibull_distribution (C++11)
extreme_value_distribution (C++11)
Les distributions normales
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Normal distributions
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normal_distribution (C++11)
lognormal_distribution (C++11)
chi_squared_distribution (C++11)
cauchy_distribution (C++11)
fisher_f_distribution (C++11)
student_t_distribution (C++11)
Distributions d'échantillonnage
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Sampling distributions
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discrete_distribution (C++11)
piecewise_constant_distribution (C++11)
piecewise_linear_distribution (C++11)
Séquences de semences
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Seed Sequences
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seed_seq (C++11)
Bibliothèque C
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C library
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rand
srand
RAND_MAX
 
Déclaré dans l'en-tête <cstdlib>
int rand();
Retourne une répartie uniformément pseudo-aléatoire valeur entière comprise entre ​0​ et RAND_MAX (0 et RAND_MAX comprises) .
Original:
Returns a uniformly distributed pseudo-random integral value between ​0​ and RAND_MAX (0 and RAND_MAX included).
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srand() doit être appelée avant tout appel à rand() pour initialiser le générateur de nombres aléatoires .
Original:
srand() should be called before any calls to rand() to initialize the random number generator.
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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

Pseudo-aléatoire valeur entière comprise entre ​0​ et RAND_MAX .
Original:
Pseudo-random integral value between ​0​ and RAND_MAX.
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[modifier] Exemple

#include <cstdlib>
#include <iostream>
#include <ctime>
 
int main() 
{
    std::srand(std::time(0)); //use current time as seed for random generator
    int uniform_random_variable = std::rand();
    std::cout << "Uniform random value on [0 " << RAND_MAX << "]: " 
              << uniform_random_variable << '\n';
}

Résultat possible : 

Uniform random value on [0 2147483647]: 1373858591

[modifier] Voir aussi
initialise générateur de nombre pseudo-aléatoire
Original:
initializes pseudo-random number generator
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(fonction) [edit]
C documentation for rand
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/random/rand&oldid=49067 »