// Fig. 18.7: Fig18_07.cpp
// Demonstrating string member functions erase and replace.
#include <iostream>
using std::cout;
using std::endl;

#include <string>
using std::string;

int main()
{
   // compiler concatenates all parts into one string
   string string1( "The values in any left subtree"
      "\nare less than the value in the"
      "\nparent node and the values in"
      "\nany right subtree are greater"
      "\nthan the value in the parent node" );
   
   cout << "Original string:\n" << string1 << endl << endl;

   // remove all characters from (and including) location 62 
   // through the end of string1
   string1.erase( 62 );

   // output new string
   cout << "Original string after erase:\n" << string1
      << "\n\nAfter first replacement:\n";
             
   int position = string1.find( " " ); // find first space

   // replace all spaces with period
   while ( position != string::npos ) 
   {
      string1.replace( position, 1, "." );
      position = string1.find( " ", position + 1 );
   } // end while
    
   cout << string1 << "\n\nAfter second replacement:\n";
   
   position = string1.find( "." ); // find first period

   // replace all periods with two semicolons
   // NOTE: this will overwrite characters
   while ( position != string::npos )
   {
      string1.replace( position, 2, "xxxxx;;yyy", 5, 2 );
      position = string1.find( ".", position + 1 );
   } // end while

   cout << string1 << endl;
   return 0;
} // end main

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