如何用引用交换两个字符串!

#include <iostream>
using namespace std;
void change(char* &a,char* &b)
{
char *c=a;
a=b;
b=c;
}

int main()
{
char *a="zaijian";
char *b="beybey";
change(a,b);
cout<<a<<endl<<b<<endl;
return 0;
}