/* Illustrates some of the standard C++ string functions (find, replace,
   erase, insert) as well as using string objects with functions and 
   the assignment ( = ) and concatenation ( +, += ) operators.  Also,
   const is used for arrays passed to functions whose elements should not
   be modified.
*/

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

string func(string, const string[], string&, string[]);

void main(){
  
  char cc[] = "A C string";

  string st1("String of many words."), st2 = "many";  
  /* using ( ) or = to initialize a string object; these are equivalent */

  int i;

  i = st1.find(st2);

  st1.replace(i,4,"few");
  cout << st1 << endl;

  st1.erase (10,4);
  cout << st1 << endl;

  st1.insert (10,"simple ");
  cout << st1 << endl;

  st2 = cc;
  /* can just use = to copy a C string into a string object */

  cout << st2 << endl;

  cout << "********************"<< endl;

  string s1 = "String object. ", 
    s2[3] = {"Array of ", "three string ", "objects."}, s3;
  string s4 = "Modifiable string", 
    s5[2] = {"Modifiable array", "Modifiable"};

  s3 = func(s1,s2,s4,s5);

  cout << s3 << endl << s4 << endl << s5[0] << endl << s5[1] << endl;
}

string func(string ss1, const string ss2[], string& ss4, string ss5[]){

  ss4 += " modified.";
  ss5[0] += ", element zero.";
  ss5[1] += " array, element one.";
  return (ss1 + ss2[0] + ss2[1] + ss2[2]);
}