Briefly describe the purpose of the following program. Identify the errors if any. Statethe line number and the error therein while writing your answer. (6 Marks)1. import java.util.*;2. public class MidExamPracticeQ2{3. public static void main(String[] a){4. int choice, num1, num2;5. Scanner keyboard = new Scanner(System.in);6. do7. {8. System.out.print("Enter a number: ");9. num1 = keyboard.nextDouble();10. System.out.print("Enter another number: ");11. num2 = keyboard.nextDouble();12. System.out.println("Their sum is " + num1 + num2);13. System.out.println("Do you want to do this again? ");14. System.out.print("1 = yes, 0 = no ");15. choice = keyboard.nextInt();16. } while (choice = 1)17. }18. }
Question
Briefly describe the purpose of the following program. Identify the errors if any. Statethe line number and the error therein while writing your answer. (6 Marks)1. import java.util.*;2. public class MidExamPracticeQ2{3. public static void main(String[] a){4. int choice, num1, num2;5. Scanner keyboard = new Scanner(System.in);6. do7. {8. System.out.print("Enter a number: ");9. num1 = keyboard.nextDouble();10. System.out.print("Enter another number: ");11. num2 = keyboard.nextDouble();12. System.out.println("Their sum is " + num1 + num2);13. System.out.println("Do you want to do this again? ");14. System.out.print("1 = yes, 0 = no ");15. choice = keyboard.nextInt();16. } while (choice = 1)17. }18. }
Solution
The purpose of this program is to take two numbers as input from the user, calculate their sum, and display it. The program then asks the user if they want to repeat the process. If the user enters 1, the process repeats; if they enter 0, the program ends.
However, there are a couple of errors in the program:
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Line 9 and 11: The variables num1 and num2 are declared as integers (line 4), but the program is trying to assign them a double value with the nextDouble() method. This will cause a compile-time error. The correct method to use here is nextInt().
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Line 12: The program is trying to print the sum of num1 and num2, but it's actually concatenating them as strings because of the "+" operator. To fix this, the sum should be calculated before being converted to a string. The corrected line should be: System.out.println("Their sum is " + (num1 + num2));
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Line 16: The while condition is using the assignment operator "=" instead of the equality operator "==". This will cause a compile-time error. The corrected line should be: } while (choice == 1);
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