/* Code for exercise 16.3. |  | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose.  It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*/#include <algorithm>#include <cctype>#include <iostream>#include <iterator>#include <string>#include <vector>using std::string;// Utility function-object to convert alphabetic characters// to lower-case:struct LowerCase {   char operator()(char const &c) const      { return std::tolower(c); }};void process_data(std::vector<std::string> &fruits) {   for (std::vector<string>::iterator p = fruits.begin();        p!=fruits.end(); ++p)      if ((*p)[0]=='a')         std::cout << *p << '\n';}int main() {   string fruit;   std::vector<string> fruits;   std::cout << "Enter fruit names. Terminate with \".\" (period).\n";   while((std::cin >> fruit) && (fruit[0]!='.')) {      std::transform(fruit.begin(), fruit.end(),                     fruit.begin(), LowerCase());      fruits.push_back(fruit);   }   process_data(fruits);   return 0;}