Increasing Counter When User Inputs C / D Or E

We are writing our own classes and methods. My instructor has provide the code

/*-------------------------------------------------------------------------
import java.util.*;
public class Assignment5 {
public static void main (String[] args) {

[Code].....

I am having trouble with the question counter. I need the counter to increase when c, d or e are entered. I think I need to set up a if or while loop but I'm not sure how to setup the variables. This is what I have for the counter so far.

[public int getNumberOfQuestions(){
numQuestions = 0;
numQuestions ++;
return numQuestions;
}