1 #include <iostream> 2 #include <string> 3 main(int argc,char const * argv[])4int main (int argc, char const *argv[]) 5 { 6 std::string str = "Hello world"; 7 std::cout << str << std::endl; 8 std::cout << str.c_str() << std::endl; 9 #if 0 10 print str 11 print str.c_str() 12 #endif 13 return 0; // Please test these expressions while stopped at this line: 14 } 15