public member function
<random>
| (1) | explicit geometric_distribution ( double p = 0.5 ); |
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| (2) | explicit geometric_distribution ( const param_type& parm ); |
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Construct geometric distribution
Constructs a geometric_distribution object, adopting the distribution parameter specified either by p or by object parm.
Parameters
- 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
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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;
}
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Possible output:
each star is 5 spaces away from the next (on average):
* * * ** * * * * * ** *
* * * * * * * * * * ** *
* * * * * * * * **** * ** * **
* ** * * * * * * ** * * * *
*** * * * * * * * * * * ** ***
* *** * ** * * ** * * *
* * * * * * ***
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