Thread: getch() for g++?

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I found similar post from the forum, but I have another problem.
The code below I replaced ans=getch() with cin >> ans, but it fell into the next else(assuming user enter 'y') and printed. It was working fine and looped back to the start of the for loop if I keep ans=getch().

"Incorrect format
Would you like to try again? (Y/N)"


Shouldn't the program goes back to the start of the for loop instead of get into the else?

Code:

               string fx;// store the user input of a term
               char ans;// get user input for continue of exit
               bool flagf=false;// keep track if polyf and polyg are zero
               bool flagg=false;
               bool has_entered;

                for(;;)
               {
                      system("CLS"); // Clear the console
                      cout << "\nAddition:\n\n" << endl;
                      cout << "Please enter each polynomial term in the format of: cx^k\n" << endl;
                      cout << "f(x)= ";
                      
                      if (flagf)// Check if polyf is zero
                      {polyf.disp_poly();}// Display polyf if not zero
                      
                      getline(cin, fx);// get user input of each term
                      if (check_string(fx)==true)// if user input is corrected
                      {
                            has_entered=addterm(fx,polyf);// check if the term exceeded MAX
                            if (has_entered)
                            {}
                            else// Exceeded MAX
                            {
                                cout<<"\n\nExceeded maximum degree of 19"<<endl<<endl;
                                system("PAUSE");
                                continue;    // loop back to the beginging of for loop
                            }
                            flagf=true;
                            
                            //Check if user want to add more terms
                            cout << "\n\n\n\n\n\n\n\n\nWould you like to add more term(s) to f(x)? (Y/N)";
                            cin >> ans;// wait for user input
                            if (ans=='N'||ans=='n')// if user entered 'N' or 'n' then break the for loop
                            {
                                   break;                               
                            }
                            else if (ans=='Y'||ans=='y')// If user entered 'Y' or 'y' then do nothing
                            {;}
                            
                      }
                      else// User input is not corrected
                      {   //check if user want to try again
                          cout << "\n\n\n\nIncorrect format" << endl;
                          cout << "\n\n\n\nWould you like to try again? (Y/N)";
                          ans=getch();// wait for user input
                          if (ans=='N'||ans=='n')
                            {
                                   break;  //If user entered 'N' or'n' the break the for loop                             
                            }
                            else if (ans=='Y'||ans=='y')
                            {}
                      }
               }

I tried to substitute cin >> ans with the following function with ans=YorN(), but it is still doing the same thing. getline(cin, fx) still picks up the Enter key.
Please help.

Code:

char YorN()
{
     char ans;
     cin >> ans;
     return ans;
}