[求助]二级指针

#include <iostream>
using namespace std;
void f(int ** p)
{
cout<<"*p = "<<(long)*p<<endl;
*p++;
cout<<"*p = "<<(long)*p<<endl;//这里为什么输出的是值49，而上面输出的是地址呢？

}
int main()
{
int i =49;
int * ip = &i;
cout<<"ip = "<<(long)ip<<endl;
f(&ip);
return 0;
}