有以下等程序#include ＜string. h＞void f(char *s,
题型：单项选择题
问题：
有以下等程序
#include ＜string. h＞
void f(char *s, char *t)
char k;
k=*s; *s=*t; *t=k;
s++;t--;
if(*s) f(s, t);main ()
char stt[10] ="abcdefg", *p;
p=str+strlen (str)/2+1;
f (p,p-2);
print f ( "%s\n", str);
A．abcdefg
B．gfedcba
C．gbcdefa
D．abedcfg