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Using string swap function to swap two strings

#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