Thread: Java program to generate random questions

Hello java. Welcome to the forums

I have wrote this example for you to look at.
There is no error handling to check what the user inputs but the functionality is there.

import java.util.Scanner;
 
public class JavaQuestions {
 
    /**
     * JavaProgrammingForums.com
     */
 
    // Global variables
    static String[] rangeArray = null;
    static int startRange, endRange;
 
    public void userInput(){
 
        // Scanner class to take user input
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a range between 1 and 20. eg 5-10: ");
        String firstRange = sc.nextLine();
 
        // Split the input String
        rangeArray = firstRange.split("-");
 
        // Assign range values
        startRange = Integer.parseInt(rangeArray[0]);
        endRange = Integer.parseInt(rangeArray[1]);
 
        // doMaths method
        doMaths();        
    }
 
    public void doMaths(){
 
        System.out.println("Questions:");
 
        // Loop 5 times and print
        for(int i = 0; i < 5; i++){
 
            // Generate random number between startRange and endRange
            int randomPt1 = (int)(Math.random() * (endRange - startRange + 1) ) + startRange;
 
            // Generate random number between 1 and 10
            int randomPt2 = (int)(Math.random() * (10 - 1 + 1) ) + 1;
 
            // Print math questions
            System.out.println(randomPt1 + " * " + randomPt2 + " = ?");        
        }                
    }
 
 
    public static void main(String[] args) {
 
        JavaQuestions j = new JavaQuestions();
        j.userInput();
 
    }
}

Example output:

Enter a range between 1 and 20. eg 5-10:
1-20
Questions:
11 * 5 = ?
13 * 5 = ?
8 * 5 = ?
11 * 8 = ?
20 * 1 = ?