/*
 *          File: String-test.cpp
 *        Author: Robert I. Pitts <rip@cs.bu.edu>
 * Last Modified: November 17, 1999
 *         Topic: A String Class: Part I - Lab
 * ----------------------------------------------------------------
 *
 * This program demonstrates a very basic String class.  It creates
 * a few String objects and sends messages to (i.e., calls methods on)
 * those objects.
 *
 */


#include <iostream.h>
#include "mystring.h"


/************************ Function Prototypes ************************/

/*
 * Function: PrintStrings
 * Usage: PrintStrings(str1, str2, str3);
 *
 * Prints out the value and length of the 3 String objects passed to it.
 */
void PrintStrings(const String &str1, const String &str2, const String &str3);


/*************************** Main Program **************************/

int main()
{
  String str1, str2, str3;   // Some string objects.
  char s[100];               // Used for input.

  // Print out their initial values...

  cout << "Initial values:" << endl;
  PrintStrings(str1, str2, str3);

  // Store some values in them...

  cout << "\nEnter a value for str1 (no spaces): ";
  cin >> s;
  str1.assign(s);

  cout << "\nEnter a value for str2 (no spaces): ";
  cin >> s;
  str2.assign(s);

  cout << "\nEnter a value for str3 (no spaces): ";
  cin >> s;
  str3.assign(s);

  cout << "\nAfter assignments..." << endl;
  PrintStrings(str1, str2, str3);

  // Access some elements...

  int i;

  cout << "\nEnter which element of str1 to display: ";
  cin >> i;
  cout << "Element #" << i << " of str1 is '" << str1.element(i)
       << "'" << endl;

  cout << "\nEnter which element of str2 to display: ";
  cin >> i;
  cout << "Element #" << i << " of str2 is '" << str2.element(i)
       << "'" << endl;

  cout << "\nEnter which element of str3 to display: ";
  cin >> i;
  cout << "Element #" << i << " of str3 is '" << str3.element(i)
       << "'" << endl;

  // Append some strings...

  String append_str;

  cout << "\nEnter a value to append to str1 (no spaces): ";
  cin >> s;
  append_str.assign(s);
  str1.append(append_str);

  cout << "\nEnter a value to append to str2 (no spaces): ";
  cin >> s;
  append_str.assign(s);
  str2.append(append_str);

  cout << "\nEnter a value to append to str3 (no spaces): ";
  cin >> s;
  append_str.assign(s);
  str3.append(append_str);

  cout << "\nAfter appending..." << endl;
  PrintStrings(str1, str2, str3);

  // Compare some strings...

  int cmp = str1.compare_to(str2);

  cout << "\nComparing str1 and str2..." << endl;

  cout << "\"";
  str1.print();
  cout << "\" is ";

  if (cmp < 0) {
    cout << "less than";
  } else if (cmp > 0) {
    cout << "greater than";
  } else {
    cout << "equal to";
  }

  cout << " \"";
  str2.print();
  cout << "\"" << endl;

  return 0;
}


/*********************** Function Definitions **********************/

void PrintStrings(const String &str1, const String &str2, const String &str3)
{
  cout << "str1 holds \"";
  str1.print();
  cout << "\" (length = " << str1.length() << ")" << endl;

  cout << "str2 holds \"";
  str2.print();
  cout << "\" (length = " << str2.length() << ")" << endl;

  cout << "str3 holds \"";
  str3.print();
  cout << "\" (length = " << str3.length() << ")" << endl;
}