string stops at first letter

Hey, can anyone help me figure out why the program keeps stopping with the first letter instead of following through the string??

Code:

---

#include <iostream>
#include <string>


using namespace std;


bool isVowel (char);
string noVowelString (string);


int main ()
{
        string str;


        cout<<"Enter a sentence: ";
        cin>>str;
        cout<<endl;


        cout<<"The sentence with the vowels removed is "<<noVowelString(str)<<endl;


       
    system("pause");
    return 0;
}


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


string noVowelString (string tStr)
{
        string :: size_type len=tStr.length();


        bool foundVowel = false;


        string :: size_type i;


        for (i = 0; i < tStr.length; i++)
        {
                if (isVowel (tStr[i]))
                {
                        tStr.erase (i, 1);
                        foundVowel = true;
                }


                else
                        tStr = tStr.substr (i, 1);
        }
        return tStr;
}

---

You can't use the extraction operator>> to extract sentences. The extraction operator>> stops processing the string when it encounters a white space character. If you want your string to contain white space characters I recommend you try using the getline() function.

Jim

You're also modifying the string as you iterate over it, which spells disaster.