有以下程序
#include <stdio.h>
main()
{ FILE *pf;
char *s1="China",*s2="Beijing";
pf=fopen("abc.dat","wb+");
fwrite(s2,7,1,pf);
rewind(pf);
fwrite(s1,5,1,pf);
fclose(pf);
}
以上程序执行后 abc.dat 文件的内容是
A)China
B)Chinang
C)ChinaBeijing
D)BeijingChina
