lỗi truyền mảng

#include <iostream>
#include <iomanip>
using namespace std;

struct mang
{
    int *p;
    int soPhanTu;
};

void inMang(const mang& m)
{
    int k=m.soPhanTu;
    cout<<"Mang in ra:\n";
    for(int i=0; i<k; i++)
        cout<<setw(10)<<m.p[i]<<setw(30)<<&(m.p[i])<<endl;
    cout<<endl;
}

mang mang2(const mang& m)
{
    const int k=(m.soPhanTu+1)/2;
    int p2[k];
    cout<<"Tao mang khac:\n";
    for(int i=0; i<k; i++){
        p2[i]=m.p[i];
        cout<<setw(10)<<p2[i]<<setw(30)<<&(p2[i])<<endl;
    }
    mang r={p2, k};
    return r;
}

int main()
{
    int mang1[]={1,2,3,4,5,6,7,8};
    mang m1={mang1,8};
    inMang(m1);
    inMang(mang2(m1));
}