Question

Java Programming: Loops and Conditionals

Answer 1

Answer:

1. import java.util.Scanner;
2. import java.util.Random;
3. public class Main {
5.    public static void main(String[] args) {
7.        Scanner input = new Scanner(System.in);
8.        Random rand = new Random();
10.        System.out.print("Enter number of questions you wish to practice: ");
11.        int n = input.nextInt();
13.        int i = 1;
14.        while(i <= n){
15.            int num1 = 1 + rand.nextInt(10);
16.            int num2 = 1 + rand.nextInt(10);
17.            int answer = num1 * num2;
18.            System.out.print("Question " + i + ": " + num1 + " x " + num2 + " = ");
19.            int response = input.nextInt();
21.            if(response == answer){
22.                System.out.println("Correct answer!");
23.            }
24.            else{
25.                System.out.println("Wrong answer. It should be " + answer);
26.            }
27.            i++;
28.        }
29.    }
30. }

Explanation:

Firstly, we import Scanner and Random classes (Line 1-2) as we need to get user input for number of questions and generate random number in each question.

Next, create a Scanner and Random object (Line 7-8).  Prompt user to input number of question and get the input using the Scanner object (Line 10-11).

Next create a while loop and set the condition to loop for n number of times (based on number of questions) (Line 14). In the loop, use Random object nextInt method to generate two integers between 1 -10 (Line 15-16). Prompt user to input an answer using the Scanner object (Line 18-19). If the response is matched with answer print a correct message (Line 21-22) other wise inform user they write a wrong answer and show the correct answer (Line 24-25).