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Showing content from https://cplusplus.com/reference/random/geometric_distribution/geometric_distribution/ below:

public member function

<random>

explicit geometric_distribution ( double p = 0.5 );

explicit geometric_distribution ( const param_type& parm );

Construct geometric distribution

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.

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// geometric_distribution example
#include <iostream>
#include <chrono>
#include <string>
#include <random>

int main()
{
  // construct a trivial random generator engine from a time-based seed:
  int seed = std::chrono::system_clock::now().time_since_epoch().count();
  std::default_random_engine generator (seed);

  std::geometric_distribution<int> distribution (1.0/5);

  std::cout << "each star is 5 spaces away from the next (on average):" << std::endl;
  for (int i=0; i<100; ++i) {
    int number = distribution(generator);
    std::cout << std::string (number,' ') << "*";
  }

  return 0;
}

each star is 5 spaces away from the next (on average):
             *  *   *          ** *       *               *    * * **     *
*  *        *    *  *                      *    * *         *      *     ** *
*      *       *       *       *       * *       *  ****         *    **  *   **
   *     **  *      *  *  *    *   * **        *                   *     *  *
 ***   *    *   *          *   *  *       * * *           *            ** ***
 * ***          *       **              *   *  **                      *   *  *
   *  *          *   *            *  *         ***

geometric_distribution::reset

Reset distribution (public member function)

geometric_distribution::param

Distribution parameters (public member function)

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