// Rick Mercer 5-Oct-95
//
// Demonstrate the string class as defined in the draft ANSI document as:
//
//              typedef basic_string<char> string;
//
#include <cstring.h>   // Borland's 4.5 cstring works (except for empty)
#include <iostream.h>
#include <assert.h>

void main()
{
   string s1, s2, s3;

   s1 = "First";
   s2 = "Second";
   s3 = "Third";

   // length returns the number of characters currently stored in the object

   cout << s1.length() << endl;

   assert (s1.length() == 5);

/* BORLAND DOES NOT IMPLEMENT empty

   // Make s3 empty with assignment of the null string
   s3 = "";
   // assert: s3 is a null string

   if(s3.empty())
     cout << s3.length() << endl;
   // assert: s3 is empty. s3 stores the null string (s3's length == 0).

   TODO: Remove comment
*/

   s3 = "A new string";

   // the subscript operator [ ] returns individual characters,
   // with [0] referencing the first character
   cout << "s3[4] == " << s3[4] << endl;
   // assert: s3[4] == 'w'

   // Change s1 and s2 for use in the next several examples
   s1 = "abcDEFghiHKLabcDEF";
   s2 = "DEF";

   // find the position of the occurrence of a string (s2) in another (s1)
   // If the string argument is not found, find returns a negative number

   int pos1 = s1.find(s2);
   // Assert: pos1 == 3

   int pos2 = s1.find("Not There");
   // Assert: pos2 < 0

   // Find the first occurrence of a character in a string (s1)

   int pos3 = s1.find('K');
   // Assert: pos3 == 10

   cout << "\nPositions" << endl;
   cout << "pos1: " << pos1 << endl;
   cout << "pos2: " << pos2 << endl;
   cout << "pos3: " << pos3 << endl;

}