worksheet 2.java

import java.util.Scanner; // Scanner import
public class worksheet2 { // program begins
    public static void main(String[] args) {

        //Question taken from CAPE Pure Mathematics June 2018 Paper 1, #16

        Scanner input = new Scanner (System.in); // Scanner declaration

        // variable declaration

        int answer;
        final int ans1 = 4, ans2 = 15, ans3 = -2, ans4 = 0;

        System.out.println("A circle is defined as (x+2)^2 + y^2 = 4. The gradient of the normal to the circle at (0,0) is: ? Your options: 4, 15, 0, -2 or 999 to exit.");
        answer = input.nextInt();

        while (answer != 999) { //while loop being used as a continuous loop, and it can be exited when 999 is entered.

            //if statements being used to compare the answer the user entered with the ones that have been initialised within program
            if(answer == ans1) {
                System.out.println("4 is the incorrect answer, please try again.");
            }
            if(answer == ans2) {
                System.out.println("15 is the incorrect answer, please try again.");
            }
            if(answer == ans3) {
                System.out.println("-2 is the incorrect answer, please try again.");
            }
            if(answer == ans4) {
                System.out.println("0 is the correct answer. Congratulations!");
            }
            //updating variable within loop
            System.out.println("A circle is defined as (x+2)^2 + y^2 = 4. The gradient of the normal to the circle at (0,0) is: ? Your options: 4, 15, 0, -2 or 999 to exit.");
            answer = input.nextInt();
        } //while loop ends

        System.out.println("Thank you for answering."); //goodbye statement, will appear when 999 is entered
    }
} //program ends