19.5. Swapping strings

Class string provides member function swap for swapping strings. Figure 19.4 swaps two strings. Lines 9–10 declare and initialize strings first and second. Each string is then output. Line 15 uses string member function swap to swap the values of first and second. The two strings are printed again to confirm that they were indeed swapped. The string member function swap is useful for implementing programs that sort strings.

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 1   // Fig. 19.4: Fig19_04.cpp
 2   // Using the swap function to swap two strings.
 3   #include <iostream>
 4   #include <string>
 5   using namespace std;
 6
 7   int main()
 8   {
 9      string first( "one" );
10      string second( "two" );
11
12      // output strings
13      cout << "Before swap: first: " << first << " second: " << second;
14
15      first.swap( second ); // swap strings
16
17      cout << " After swap: first: " << first
18         << " second: " << second << endl;
19   } // end main

Before swap:
 first: one
second: two

After swap:
 first: two
second: one

Fig. 19.4. Using the swap function to swap two strings.

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