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+// Fig. 16.9: fig16_09.cpp


+// Converting to C-style strings.


+#include <iostream>


+


+using std::cout;


+using std::endl;


+


+#include <string>


+


+using std::string;


+


+int main()


+{


+   string string1( "STRINGS" );


+   const char *ptr1 = 0;


+   int length = string1.length();


+   char *ptr2 = new char[ length + 1 ];  // including null


+   


+   // copy characters from string1 into allocated memory


+   string1.copy( ptr2, length, 0 );


+   ptr2[ length ] = '\0';  // add null terminator


+


+   // output 


+   cout << "string s is " << string1


+        << "\nstring1 converted to a C-Style string is "


+        << string1.c_str() << "\nptr1 is ";


+


+   // Assign to pointer ptr1 the const char * returned by


+   // function data(). NOTE: this is a potentially dangerous


+   // assignment. If string1 is modified, pointer ptr1 can


+   // become invalid.


+   ptr1 = string1.data();  


+   


+   // output each character using pointer


+   for ( int i = 0; i < length; i++ )


+      cout << *( ptr1 + i );   // use pointer arithmetic


+


+   cout << "\nptr2 is " << ptr2 << endl;


+   delete [] ptr2;


+   return 0;


+


+}  // end main


+


+/**************************************************************************


+ * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice      *


+ * Hall. All Rights Reserved.                                             *


+ *                                                                        *


+ * DISCLAIMER: The authors and publisher of this book have used their     *


+ * best efforts in preparing the book. These efforts include the          *


+ * development, research, and testing of the theories and programs        *


+ * to determine their effectiveness. The authors and publisher make       *


+ * no warranty of any kind, expressed or implied, with regard to these    *


+ * programs or to the documentation contained in these books. The authors *


+ * and publisher shall not be liable in any event for incidental or       *


+ * consequential damages in connection with, or arising out of, the       *


+ * furnishing, performance, or use of these programs.                     *


+ *************************************************************************/