5.2 (Repeat additions) Listing 5.4, SubtractionQuizLoop.java, generates five random
subtraction questions. Revise the program to generate ten random addition questions
for two integers between 1 and 15. Display the correct count and test time.
import java.util.Scanner; public class ProgrammingEx5_2 { public static void main(String[] args) { final int NUMBER_OF_QUESTIONS = 10; // Number of questions int correctCount = 0; // Count the number of correct answers int count = 0; // Count the number of questions long startTime = System.currentTimeMillis(); String output = ""; // output string is initially empty Scanner input = new Scanner(System.in); while (count < NUMBER_OF_QUESTIONS) { // 1. Generate two random single-digit integers int number1 = (int) (Math.random() * 16); int number2 = (int) (Math.random() * 16); // 3. Prompt the student to answer “What is number1 + number2?” System.out.print("What is " + number1 + " + " + number2 + "? "); int answer = input.nextInt(); // 4. Grade the answer and display the result if (number1 + number2 == answer) { System.out.println("You are correct!"); correctCount++; } else System.out.println("Your answer is wrong.\n" + number1 + " + " + number2 + " should be " + (number1 + number2)); // Increase the count count++; output += "\n" + number1 + " + " + number2 + "=" + answer + ((number1 + number2 == answer) ? " correct" : " wrong"); } long endTime = System.currentTimeMillis(); long testTime = endTime - startTime; System.out.println("Correct count is " + correctCount + "\nTest time is " + testTime / 1000 + " seconds\n" + output); } }
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