5.6.3 随机数

#include<iostream>
#include<vector>
#include<random>
using namespace std;
template<typename T>class RandT{
public:
RandT(T low,T high):dist{low,high}{}
T operator()(){ return dist(re);}
private:
default_random_engine re;
uniform_int_distribution<>dist;
};
int main(){
    RandT<int> rnd{0,4};
    vector<int>histogram(5);
    for(int i=0;i!=200;++i){
        ++histogram[rnd()];
    }
    for(int i=0;i!=5;++i){
        cout<<i<<'\t';
        for(int j=0;j!=histogram[i];++j)
        cout<<"*";
        cout<<endl;
    }
    system("pause");
    return 0;
}

F:\Codes\test>a.exe
0       ****************************************
1       ************************************
2       *********************************************
3       *************************************
4       ******************************************
请按任意键继续. . .