# std::binomial_distribution::param

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< cpp‎ | numeric‎ | random‎ | binomial distribution

param_type param() const; | (1) | (since C++11)
void param( const param_type& params ); | (2) | (since C++11)

Manages the associated distribution parameter set.

1) Returns the associated parameter set.

2) Sets the associated parameter set to `params`

### Parameters

params | - | new contents of the associated parameter set

### Return value

1) The associated parameter set

2) (none)

### Complexity

Constant.

### Example

Run this code

    #include <iostream>
    #include <random>

    int main()
    {
        std::random_device rd;
        std::mt19937 gen(rd());
        using BinomialDist = std::binomial_distribution<>;
        BinomialDist bino_dis(1, 0.5);

        std::cout << "A sample of Binomial(  1, 0.5): " << bino_dis(gen) << '\n';

        // Use another parameter set
        bino_dis.param(BinomialDist::param_type(100,0.9));
        std::cout << "A sample of Binomial(100, 0.9): " << bino_dis(gen) << '\n';
    }

Possible output:

    A sample of Binomial(  1, 0.5): 0
    A sample of Binomial(100, 0.9): 94

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