I'll warn you ahead of time...howework help

I am currently writing a Pig Latin program that simulates the pig latin language. I have gotten the program to read one word and covert it but now I need it to transform an entire sentence and I am stuck. I have no clue where to go from here, I just can't figure out how to read more than one word. Thanks for your help guys!

Code:

#include <iostream>
#include <string>

using namespace std;

bool isVowel(char ch);
string rotate(string pStr);
string pigLatinString(string pStr);

int main()
{
	string str;
	cout << "Enter a string: ";
	cin >> str;
	cout << endl;

	cout << "The Pig Latin form of " << str << " is: "
		 << pigLatinString(str) << endl;

	return 0;
}
bool isVowel(char ch)
{
	switch (ch)
	{
	case 'A': case 'E':
	case 'I': case 'O':
	case 'U': case 'Y':
	case 'a': case 'e':
	case 'i': case 'o':
	case 'u': case 'y': return true;
	default: return false;
	}
}

string rotate(string pStr)
{
	string::size_type len = pStr.length();
	
	string rStr;
	
	rStr = pStr.substr(1, len - 1) + pStr[0];
	
	return rStr;
}

string pigLatinString(string pStr)
{
	string::size_type len;

	bool foundVowel;

	string::size_type counter;

	if (isVowel(pStr[0]))
		pStr = pStr + "-way";
	else
	{
		pStr = pStr + '-';
		pStr = rotate(pStr);
		len = pStr.length();
		foundVowel = false;

		for (counter = 1; counter < len - 1; counter++)
			if (isVowel(pStr[0]))
			{
				foundVowel = true;
				break;
			}
			else
				pStr = rotate(pStr);

		if (!foundVowel)
			pStr = pStr.substr(1, len) + "-way";
		else
			pStr = pStr + "ay";
	}
	return pStr;
}

>I just can't figure out how to read more than one word.
That's easy, just wrap your input and conversion into a loop:

Code:

while ( cin>> str )
  cout<< pigLatinString(str) <<' ';

If you want more control then you'll pretty much need to save the converted words or add a wrapper to pigLatinString that loops over the words in a sentence so that you can use getline.