// pgm31
// using the C++ string class + operator, [] operator, +=
// relational operators
// 11/21/2016

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;

int main()
{
    string first, last, fullname;
    cout << "Enter first and last name: ";
    cin >> first >> last;
    fullname = last+','+first;
    cout << "fullname is: " << fullname << endl;

    string noun, single, example;
    cout << "enter a noun: ";
    cin >> noun;
    single=noun;
    // same as: noun = noun+"s";
    noun += "s";
    if (single==noun)
         cout << "same.";
    else
         cout << "not equal." << endl;

   // Wrong! assigning to a string literal
   //"S" += noun;

   cout << "Plural: " << noun << endl;
   cout << "iterate through elements of string and "
        << "change every e to i" << endl;
   for (int i=0; i<noun.length(); i++) {
        if (noun[i]=='e')
            noun[i]='i';
        cout << noun[i] << endl;
   }

   // this does not work since neither of the addends
   // are C++ strings
//   example = "Hello " + "World!";

// note that relational operators work fine with strings
// BUT MAY NOT BE USED WITH ARRAYS
   string finished="not";
   while (finished!="done") {
       cout << "are you done? Enter the word done if you are.";
       cin >> finished;
   }
   return 0;
}

LAB1 for Today:
// Write a program to read in strings (loop)
// If the length of the string is > 10
//      print "that is long"
// otherwise
//      print "thank you."
// you decide when to terminate the loop.