C++ :: Returning Operator To Switch Statement

I planned to build a four function fraction calculator adding some advance feature like error checking in input so that user are prompted to input correct numbers and operator.

I created a separate member function getOper() function for getting correct operator and getFrac() function for getting correct fraction.

My intention was just to get correct operator from getOper() function and returning the operator to switch in main() function to do specific calculation. But, i don't know why i am getting repeatedly error when inputting correct operator while debugging program.

Here's my complete code.

Code:
#include <iostream>
using namespace std;
char c;
class fraction {
private :
int num;

[Code] .....

I checked the program again by assigning char to variable "oper" and function "getOper(). But, result is same.And again i changed variable "oper" to default keyword operator, but, it really didn't worked as expected.