#include <iostream>
#include <string>

void main()
{  string a = "hello";                   // good
   string b = a + "you";                 // good
// string c = "hello" + "you";           // not allowed
   string c = string("hello") + "you";   // ok, one way around it
   string d;
// d += "hello" + "you";                 // also not allowed
   d = d + "hello" + "you";              // ok, another way around it
   cout << a << "\n";
   cout << b << "\n";
   cout << c << "\n";
   cout << d << "\n"; }

/* why?

C++ strings are objects defined in the <string> library.
C strings are just pointers to arrays of chars which contain the
  ascii codes of the individual characters plus a zero at the end.

Even in C++, writing "string" makes a C string, not a C++ string

class string includes these constructors

   string();                      // default, makes an empty string
   string(const string & s);      // makes a copy of an existing string
   string(char * s);              // converts from a C string
                                  // constructors can be used to convert when one type
                                  // one type (string) is explicitly expected, and another
                                  // type (char *) is given.

and these operators

   operator+(const string & s);   // appends another string
   operator+(char * s);           // appends a C string

and may others, but not the one we wanted.
It is not possible to define a new operator whose first operand is a pointer.

*/