// Demonstrate the string class as defined in the draft ANSI document as:
//
//              typedef basic_string<char> string;
//
// Each string object is an ordered sequence of characters.
//
// 6/26/95  The group that was in the Colgate PC lab for OO Workshop
//
// Modified by Rick Mercer on 25-Sep-95 and 5-Oct-95
// Note: I used Borland's string class as defined in <cstring.h>
//       The only difference I found was Borland lacks string::empty()
//       It would be simple for me to modify an existing class to
//       implement the subset.
//
// Deno preview
// 1. Declare
// 2.    ...
// 3. I/O
//
#include <cstring.h>   // Borland's 4.5 cstring works (except for empty)
#include <iostream.h>

main()
{
   //-----constructors

   string s1;
   // assert: s1 has a length of 0 (the null, or emtpy, string)

   string s2("Initializer constructor");
   // assert: s2 == "Initializer constructor" (s2's length == 11)

   string s3(s2);
   // assert: s3's characters and length are an exact copy of s2

   cout << "Initialized values: " << endl;
   cout << "s1: " << s1 << endl;
   cout << "s2: " << s2 << endl;
   cout << "s3: " << s3 << endl;

   //-----assignments

   s1 = s2;
   // assert: s1 == s2;

   s1 = "Hi";
   // assert: s1's characters are "Hi" and s1's length is 2

   s2 = 'A';
   // assert: s2's has length of 1 and s2[0] == 'A'

   cout << "\nNew values: " << endl;
   cout << "s1: " << s1 << endl;
   cout << "s2: " << s2 << endl;

      //-----stream I/O functions (>>, <<, and getline)

   // String input data is terminated like the other data,
   // by spaces, tabs, and new lines.

   cout << "Enter a string [no blanks!]: ";
   cin >> s1;
   cout << "You entered " << s1 << endl;
   // assert: Except for leading blanks, tabs, and newlines (terminators),
   //         all characters up to the first terminator are stored in s1

   // Use getline to extract entire lines that may have blanks and tabs

   cout << "Enter a line of input with blanks, press enter to stop:\n";
   getline(cin, s1);
   cout << "\nYou entered: " << s1 << endl;
   // assert: If the input was one line with the input
   //    An entire line (string with blanks)
   // then s1 == "An entire line (string with blanks)"
}