请教一个吊大的老哥

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
unsigned move(unsigned x, int n);
int main()
{
unsigned x = 0xFAFBFCFD;
x = move(x, 8);
printf("%x", x);
system("pause");
return 0;
}
unsigned move(unsigned x, int n)
{
unsigned x_head = 0;
for (x_head = x; (x_head / (pow(2, n-1)) >2); x_head = (x_head / 2));
x = (x << n) + x_head;
return x;
}
就这个。。我想要的结果是fafbfcfdfa，但是结果却是fbfcfdfa