如何生成均匀随机数 C++

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>
using namespace std;

int n=100,m=100000;

double random()
{
    return (double)rand()/RAND_MAX;
}

int random(int m)
{
    return (int)(random()*(m-1)+0.5);
}

int main()
{
    srand(time(NULL));
    cout<<n<<' '<<m<<endl;
    for(int i=0;i<m;i++)
    {
        if(rand()%2==0)
            cout<<'A';
        else
            cout<<'B';
        int X,Y;
        for(;;)
        {
            X=random(n)+1;
            Y=random(n)+1;
            if(X!=Y)
                break;
        }
        cout<<' '<<X<<' '<<Y<<endl;
    }
    return 0;
}