/* Code for exercise 20.15. |  | "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 <ctype.h>#include <iostream>#include <stdio.h>#include <string>#include <time.h>#if !defined C_STYLEbool read_string(std::string &s) {   int const buffer_size = 100;   char buffer[buffer_size+1];   int i = 0, c;   while ((c = std::cin.get()) && (std::cin) && isspace(c));   while ((c = std::cin.get()) && (std::cin) && !isspace(c)          && i!=buffer_size) {      buffer[i++] = char(c);   }   buffer[i] = '\0';   s.assign(buffer, i);   if (std::cin) {      std::cin.putback(c);      if (!isspace(c)) {         std::string remainder;         read_string(remainder);         s.append(remainder);      }      return true;   } else      return false;};#else // C_STYLE is defined:bool read_string(std::string& s) {   int const buffer_size = 100;   char buffer[buffer_size+1];   int i = 0, c;   while ((c = getc(stdin))!=EOF && isspace(c));   while ((c = getc(stdin))!=EOF && !isspace(c) && i!=buffer_size) {      buffer[i++] = char(c);   }   buffer[i] = '\0';   s.assign(buffer, i);   if (c!=EOF) {      ungetc(c, stdin);      if (!isspace(c)) {         std::string remainder;         read_string(remainder);         s.append(remainder);      }      return true;   } else      return false;};#endifint main() {   std::string word;   int n = 0;   bool not_eof;   clock_t start = clock();#if defined(SIMPLE)   while (std::cin >> word) ++n;#else   do {      not_eof = read_string(word);      ++n;   } while (not_eof);#endif   printf("Read %d words in %f seconds.\n",          n, (clock()-start)/CLOCKS_PER_SEC);   return 0;}