PigLatin problem

//file  StringOrNot.cc
//author    Justin Kingsley (kingslju@mmstate.edu) //don't just copy my code... it won't work with your program
//assignment 9
//Pig Latin

#include <iostream>
#include <fstream>
#include <string>


using namespace std;

//*prototype
bool isVowel(char ch);
string rotate(string pStr);
string pigLatinString(string pStr);

string StringOrNot()
{
    ifstream ins;
    
    string con,   //holds the information that comes form the input file
         str,          //place holder for the string about to be translated into pigLatin
         cur,         //currently translated string
         input;      //Place holder for the location of input file
    char ch;       //Place holder for current character
    int call = 0;  //tells the program if it needs to call the function pigLatinString if set to 1
   
    cout << "Please Enter in the Location of the INPUT FILE:" << endl;
    cin >> input;

    ins.open(input.c_str());
    if (ins.fail())    //Tests to see if input file is Readable
    {
        cerr << "Input file failed" << endl;
        return "Input file failed";
    }
  
    ins.get(ch);
   
    while (ins)
    {

        con = con + ch;  //con collects confirmation string
       
        switch(ch)
        {
            case '.' : case '!' : case ',' : case '?' : case ';' : case ':' : case '\n' : case ' ' : case '-' :
            {
                if(call == 1)
                {
                   cur = cur +  pigLatinString(str);    // Runs PigLatin and add the returned string to cur
                   cur = cur + ch;                               // Adds char ch to cur
                   call = 0;                                          // tells system str is empty
                   str = "";                                          // Clears str
                   ch = ins.get();                                 // gets next char value
                }
                else
                {  
                    cur = cur + ch;        // Adds ch to cur
                    ins.get(ch);              // gets next char value
                }
            break;
            }
            default:
            {
                str = str + ch;            // Adds ch to end of str(soon to be processed by PigLatin
                call = 1;                    // Tell system that str contains something          
                ins.get(ch);               // gets next char value
            }
        }
    }
    ins.close();   
    cur = cur + "\n**********************\n** Is PigLatin for: ** \n**********************\n\n" + con;
    return cur;
}