MathQuiz.java:9: error: cannot find symbol

import java.util.*; public class MathQuiz { public static void main(String[]args) { Scanner keyboard = new Scanner(System.in); System.out.println("Which modules would you like to practice? Addition, SUbtraction, Multiplication or Division?"); String modules = keyboard.nextLine(); if(modules.equalsIgnorecase("addition ")) { Random rd = new Random(); int firstNum = rd.nextInt(101); int secNum = rd.nextInt(101); int add = firstNum + secNum; System.out.printf("What is %d + %d?",firstNum, secNum); int ansAdd = keyboard.nextInt(); if(ansAdd==add) { System.out.printf("Correct%n"); } else { System.out.printf("Incorrect%n"); } } }

}

Hi guys , i've recently tried to make a math's quiz that allows the users to choose the types of quizes between addition, subtraction , multiplication and division. I've only done up to addition so far but can;t seem to get pass the 'if' statement. What I basically did was prompt the users and ask for which type of quiz they want. and i wrote a line called modules to store the answer and use it in the 'if' statement. However when i run it , it says symbol can't be found pointing to the '.' on the if(modules.equalsIgnorecase("addition "))