public member function
<random>

# std::negative_binomial_distribution::(ctor)

(1) explicit negative_binomial_distribution ( result_type k = 1, double p = 0.5 ); explicit negative_binomial_distribution ( const param_type& parm );
Construct negative binomial distribution
Constructs a negative_binomial_distribution object, adopting the distribution parameters specified either by k and p or by object parm.

### Parameters

k
Parameter k of the negative binomial distribution.
This represents the number of unsuccessful trials that stops the count of successful Bernoulli-distributed experiments each generated value is said to simulate.
result_type is a member type that represents the type of the random numbers generated on each call to operator(). It is defined as an alias of the first class template parameter (IntType).
p
Probability of success.
This represents the probability of success on each of the independent Bernoulli-distributed experiments each generated value is said to simulate.
This shall be a value between 0.0 and 1.0 (both included).
parm
An object representing the distribution's parameters, obtained by a call to member function param.
param_type is a member type.

### Example

 123456789101112131415161718192021 // negative_binomial_distribution example #include #include #include int main() { // construct a trivial random generator engine from a time-based seed: unsigned seed = std::chrono::system_clock::now().time_since_epoch().count(); std::default_random_engine generator (seed); std::negative_binomial_distribution distribution (5,0.5); std::cout << "some negative binomial results (k=5,p=0.5): "; for (int i=0; i<10; ++i) std::cout << distribution(generator) << " "; std::cout << std::endl; return 0; }

Possible output:
 some negative binomial results (k=5,p=0.5): 1 1 6 4 4 5 2 9 2 4

Constant.