// Overloading the operator + .

#include <iostream.h>
#include <stdlib.h>
#include <string.h>

const int max_len = 255;

class string {
public:
   void assign(const char* st) { strcpy(s, st); len = strlen(st); } 
   int  length() { return len; }
   void print() { cout << s << "\nLength: " << len << endl; }
   friend string operator+(const string& a, const string& b);
private:
   char s[max_len];
   int  len;
};

string operator+(const string& a, const string& b)                // overload +
{
   string tmp;

   tmp.assign(a.s);
   tmp.len = a.len + b.len;
   if (tmp.len < max_len)
      strcat(tmp.s, b.s);
   else  {
      cerr << "Max length exceeded in concatenation - bye!\n";
      exit(1);
   }
   return tmp;
}

void print(const char* c)                     // fct def for file scope print()
{
   cout << c << "\nLength: " << strlen(c) << "\n";
}

int main()
{
   string   one, two, both;
   char     three[40] = {"My name is Charles Babbage."};

   one.assign("My name is Alan Turing.");
   two.assign(three);
   print(three);                                   // file scope print() called
   // Print shorter of one and two.
   if (one.length() <= two.length())
      one.print();                                 // member fct print() called
   else
      two.print();
   both = one + two;                       // plus overloaded to be concatenate
   both.print();
   return 0;
}