隨機數引擎和分布

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17.28 編寫函數，每次調用產生並返回一個均勻分布的隨機unsigned int。

                                                                                                                                                                #include<iostream>#include<vector>#include<random>#include<ctime>using namespace std;int main(){    uniform_int_distribution<unsigned> u;    default_random_engine e();    for(size_t i=0;i<10;++i)        cout<<u(e)<<" ";    cout<<endl;    for(size_t i=0;i<10;++i)        cout<<u(e)<<" ";    cout<<endl;}

17.29 允許使用者提供一個種子作為選擇性參數。

 17_29.cpp                                                                                                                                                                       #include<iostream>#include<vector>#include<random>#include<ctime>using namespace std;int main(){    uniform_int_distribution<unsigned> u;    default_random_engine e(time(0));    for(size_t i=0;i<10;++i)        cout<<u(e)<<" ";    cout<<endl;    for(size_t i=0;i<10;++i)        cout<<u(e)<<" ";    cout<<endl;}

17.30 此次增加兩個參數，表示函數允許返回的最小值和最大值

#include<iostream>#include<vector>#include<random>#include<ctime>using namespace std;int main(){    uniform_int_distribution<unsigned> u(0,9);    default_random_engine e(time(0));    for(size_t i=0;i<10;++i)        cout<<u(e)<<" ";    cout<<endl;    for(size_t i=0;i<10;++i)        cout<<u(e)<<" ";    cout<<endl;}

 

隨機數引擎和分布