以下程序运行结果是: 
#include
void swap(char *x, char *y);
void main()
{
  char s1[] = "abc", s2[]="123";
  swap(s1,s2);
  printf("%s,%s\n",s1,s2);
}
void swap(char *x, char *y)
{
  char t;
  t = *x;
  *x = *y;
  *y = t;
}
A、1bc,a23
B、123,abc
C、321,cba
D、abc,123