为啥输出结果是efgh，有谁能跟我解释一下吗？还有就是 long *qd和(long *)p的区别是啥？

Question

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

int main()
{
     char *p = "abcdefgh",*r;
     long *q=(long *)p;
     q++;
     r = (char *)q;
     cout << r <<endl;
}