/* Code for exercise 20.16. |  | "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 <assert.h>#include <iostream>#include <string>std::string itos(int value) {   // Assume no more than 64 bits (about 20 digits):   int const bufsize = 20;   assert(sizeof(int)<=8);   char buffer[bufsize];   bool negative = value<0;   if (negative)      value = -value;   int endpos = bufsize;   do {      buffer[--endpos] = char('0'+value%10);   } while (value /= 10);   if (negative)      buffer[--endpos] = '-';   return std::string(&buffer[endpos], bufsize-endpos);}int main() {   std::cout << itos(23*34) << '\n';   std::cout << itos(-23*34) << '\n';   return 0;}