/***************************************************************************
Program:	A2Q4.cpp

Purpose:	To form plurals of English nouns according to the following rules
			if noun ends in "y", remove "y" and add "ies"
			if noun ends in "s", "ch" or "sh", add "es"
			otherwise, just add "s"
****************************************************************************/

#include <iostream>
#include <string>

using namespace std;

// Function Prototypes
void plurals(string str);

int main(){
	string input;

	// get word from user input
	cout << "\nPlease enter a word: ";
    cin >> input;
	
	// call function plurals
	plurals(input);
}

/****************************************************************************
Function:		plurals
Purpose:		form the plural of an English noun
Parameters:		string
Return Value:	NONE
****************************************************************************/
void plurals(string str){
	string end, end2, output;
	
	end = str[str.length()-1];  // get last letter in string
	end2 = str[str.length()-2]; //get 2nd last letter in string

    if (end == "y")  // string ends in y
		// get substring of noun up to 2nd last letter
		// concatenate "ies" to end of substring
		output = str.substr(0,(str.length()-1)) + "ies";
	else if (end == "s") // string ends in "s"
		// concatenate "es" to end of string
        output = str + "es";
	else if (end == "h"){  // string ends in "h"
		// check 2nd last letter to see if it is a "c" or an "s"
		if (end2 == "c" || end2 == "s")
			// if yes, concatenate "es" to end of string
            output = str + "es";
	}
	else
		// concatenate "s" to end of string
		output = str + "s";

	// output string
	cout << "\nThe plural of " << str << " is: " << output << endl;
}