C + +: Random generator Bernoulli distribution (Bernoulli distribution) detailed

Bernoulli distribution (Bernoulli distribution) is the probability of judging whether something is happening or not happening;

Given the parameter p, the probability value can be modified, the occurrence probability (true) is P, and the 1-p probability (false) is the same;

Random library, providing distributed object bernoulli_distribution, output bool value, occurrence is true, not occurred as false;

Bernoulli distribution, the probability of 0.5, can be equal to the probability output a two-dollar event, such as the sequence;

Note: The engine and the distribution object, declared outside the function, will produce a different value each time it is invoked, but it is fixed, and can be defined by a different engine, using the Times (0);

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The code is as follows:

 #include <iostream> #include <vector> #include <string> #include <random> #include &  
      
Lt;algorithm> #include <cmath> using namespace std;  
    BOOL Play (BOOL i) {std::d efault_random_engine E; Std::bernoulli_distribution b (0.6);  
    Win probability greater bool win = B (e);  
    if (a)//We win the probability of Big return win;  
else return!win;  
    int main () {std::string resp;  
    std::d efault_random_engine E;  
    Std::bernoulli_distribution b; do {bool = B (e);//Bernoulli producer Std::cout << (a) "We go Before": "I get to go" << Std::endl; Judge successively hand Std::cout << (play (a)?  
        "Congrats, you won": "Sorry, you Lost") << Std::endl; Std::cout << "Play again?"  
    Enter ' yes ' or ' no ' << Std::endl;  
    while (Std::cin >>resp && resp[0] = = ' Y ');  
return 0; }

Output:

We go  
to the congrats, you won play  
again? Enter ' yes ' or ' no '   
yes  
We go  
to Congrats, your won play  
again? Enter ' yes ' or ' no '   
yes  
We go  
to Congrats, your won play  
again? Enter ' yes ' or ' no '

Author: csdn Blog spike_king