//9_3

#include <iostream.h>
void Swap(char*& str1, char*& str2);

void main()
{
  char* ap="hello";
  char* bp="how are you?";
  cout <<ap <<endl <<bp <<endl;

  Swap(ap, bp);
  
  cout <<"交換以后:\n";
  cout <<ap <<endl <<bp <<endl;
}

void Swap(char*& str1, char*& str2)
{
  char* temp=str1;
  str1=str2;
  str2=temp;
}