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==Using string.swap function to swap two strings==


   
<source lang="cpp"> 
 
#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
   string first( "one" ); 
   string second( "two" );
   cout << "Before swap:\n first: " << first << "\nsecond: " << second;
   first.swap( second ); // swap strings
   cout << "\n\nAfter swap:\n first: " << first
      << "\nsecond: " << second << endl;
   return 0;
}
/* 
Before swap:
 first: one
second: two
After swap:
 first: two
second: one
 */        
  </source>