Thread: A strange error

Here is the main.cpp from my program .Everything works fine when the while loop is not there...i.e..it is done only once..

Code:

#include <iostream>
#include <string>
#include "token.h"
#include "rpn.h"
#include "shunt_y.h"
using namespace std;

int main()
{

    deque<token> dt;
    char q;
    string input;
    
    while(1)
    {
    cout<<"Enter the expression:\n>";
    getline(cin,input);
    dt = tokenize(input);
    dt = infix_to_rpn(dt);
    cout<<rpn_eval(dt)<<endl<<"Quit?\n>";
    cin>>q;
    if (q == 'y' )break;
    else continue;
    }
    return 0;

}

At runtime....whenever I opt not to quit....the input string automatically assumes a garbage value...not letting me into type into the prompt...
Looks somewhat like the following quote:

Enter the expression:
>log ( 10 ^ 5 ) - sin ( 3.142 / 2 )
4
Quit?
>n
Enter the expression:
>0
Quit?
>n
Enter the expression:
>0
Quit?
>

and so on...