关于动态数组到的问题

#include<iostream.h>
using namespace std;
void number(int x)
{
int*p=new int [x];
};
int main()
{
int M;
cout<<"please input array number is size: "<<endl;
cin>>M;
number(M);
cout<<"please input array number:"<<endl;
for(int i=0;i<M;i++)
{
cin>>p[i];
};
for(int i=0;i<M;i++)
{
cout<<p[i];
};
delete [] p;
}