Modified Piglatin Script

[chellebell1689]

I have an assignment to modify the below script. It currently only does one word at a time, but I'm supposed to change it so that it will do a whole sentence at a time, and place the punctuations (if any) at the end of the word.

  #include<iostream>
#include<cstdlib>
#include<cctype>
#include<iomanip>

using namespace std;

//declare user functions
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 for of "<<str<<" is: "<<pigLatinString(str)<<endl;
	
	//end program
	cout<<endl<<endl;
	system("pause");
	return 0;
}

//user defined functions
int isvowel (char ch)
{
	//change to upper case
	toupper (ch);
	
	//check to see if first letter is a vowel
	switch (ch)
	{
		case 'A':
			
		case 'E':
			
		case 'I':
			
		case 'O':
						
		case 'U':
		
		case 'Y':
			return true;
			break;
				
		default:
			return false;
			break;
	}
	
}

string rotate (string pStr)
{
	string::size_type len = pStr.length();
	
	//declare return string
	string rStr;
	
	//take off first letter and add it to the back
	rStr = pStr.substr(1, len - 1) + pStr[0];
	
	//return the new string
	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'm not looking for someone to do it for me, but I have no idea where to start.