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#i#include <iostream>   // std::cout
#include <string>     // std::string, std::stoi
 
int main ()
{
  std::string str_dec = "2001, A Space Odyssey";
  std::string str_hex = "40c3";
  std::string str_bin = "-10010110001";
  std::string str_auto = "0x7f";
 
  std::string::size_type sz;   // alias of size_t
 
  int i_dec = std::stoi (str_dec,&sz);
  int i_hex = std::stoi (str_hex,nullptr,16);
  int i_bin = std::stoi (str_bin,nullptr,2);
  int i_auto = std::stoi (str_auto,nullptr,0);
 
  std::cout << str_dec << ": " << i_dec << " and [" << str_dec.substr(sz) << "]\n";
  std::cout << str_hex << ": " << i_hex << '\n';
  std::cout << str_bin << ": " << i_bin << '\n';
  std::cout << str_auto << ": " << i_auto << '\n';
 
  return 0;
}

prog.cpp:1:2: error: invalid preprocessing directive #i
 #i#include <iostream>   // std::cout
  ^
prog.cpp: In function 'int main()':
prog.cpp:13:15: error: 'stoi' is not a member of 'std'
   int i_dec = std::stoi (str_dec,&sz);
               ^
prog.cpp:14:15: error: 'stoi' is not a member of 'std'
   int i_hex = std::stoi (str_hex,nullptr,16);
               ^
prog.cpp:14:34: error: 'nullptr' was not declared in this scope
   int i_hex = std::stoi (str_hex,nullptr,16);
                                  ^
prog.cpp:15:15: error: 'stoi' is not a member of 'std'
   int i_bin = std::stoi (str_bin,nullptr,2);
               ^
prog.cpp:16:16: error: 'stoi' is not a member of 'std'
   int i_auto = std::stoi (str_auto,nullptr,0);
                ^
prog.cpp:18:3: error: 'cout' is not a member of 'std'
   std::cout << str_dec << ": " << i_dec << " and [" << str_dec.substr(sz) << "]\n";
   ^
prog.cpp:19:3: error: 'cout' is not a member of 'std'
   std::cout << str_hex << ": " << i_hex << '\n';
   ^
prog.cpp:20:3: error: 'cout' is not a member of 'std'
   std::cout << str_bin << ": " << i_bin << '\n';
   ^
prog.cpp:21:3: error: 'cout' is not a member of 'std'
   std::cout << str_auto << ": " << i_auto << '\n';
   ^

Standard output is empty