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binomial_distribution::binomial_distribution

Constructs the distribution.

binomial_distribution(result_type t0 = 1,
    const RealType& p0 = RealType(0.5));
explicit binomial_distribution(const param_type& par0);

t0

The t distribution parameter.

p0

The p distribution parameter.

par0

The parameter package used to construct the distribution.

Precondition: 0.0 <= t0 && 0.0 <= p0 && p0 <= 1.0

The first constructor constructs an object whose stored value stored_p holds the value p0 and whose stored value stored_t holds the value t0.

The second constructor constructs an object whose stored parameters are initialized from par0.

 

// std_tr1__random__binomial_distribution_construct.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::mt19937 Myeng; 
typedef std::binomial_distribution<int, double> Mydist; 
int main() 
    { 
    Myeng eng; 
    Mydist dist(2, 0.6); 
    Mydist::input_type engval = eng(); 
    Mydist::result_type distval = dist(eng); 
 
    distval = distval;  // to quiet "unused" warnings 
    engval = engval; 
 
    std::cout << "p == " << dist.p() << std::endl; 
    std::cout << "t == " << dist.t() << std::endl; 
 
    dist.reset(); // discard any cached values 
    std::cout << "a random value == " << dist(eng) << std::endl; 
    std::cout << "a random value == " << dist(eng) << std::endl; 
    std::cout << "a random value == " << dist(eng) << std::endl; 
 
    return (0); 
    } 
 
p == 0.6
t == 2
a random value == 1
a random value == 0
a random value == 1

Header: <random>

Namespace: std

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