Write pseudocode for a flowchart that calculates and displays the sum of even numbers from 1 to 19. Also, determine the output if the loop terminates at 4 or 12.

Here are the answers to your Computer Studies questions:

16.

• a) (i) Pseudocode for the flowchart:

  START
    SET Sum = 0
    SET Count = 1
    WHILE Count < 20
      IF Count MOD 2 == 0 THEN  // Check if Count is an even number
        SET Sum = Sum + Count
      END IF
      SET Count = Count + 1
    END WHILE
    DISPLAY Sum
  STOP
  

  Copy

• a) (ii) The purpose of the above flowchart is to calculate and display the sum of all even numbers between 1 and 19 (inclusive).

• a) (iii) Determine the output from the flowchart if count is:

  • I. 4 (Assuming the loop terminates when Count reaches 4 instead of 20):
    • Initial: Sum = 0, Count = 1
    • Count = 1 (odd): Sum = 0. Count becomes 2.
    • Count = 2 (even): Sum = 0 + 2 = 2. Count becomes 3.
    • Count = 3 (odd): Sum = 2. Count becomes 4.
    • Count = 4: Loop terminates. The output is $\boxed{\text{2}}$.
  • II. 12 (Assuming the loop terminates when Count reaches 12 instead of 20):
    • Initial: Sum = 0, Count = 1
    • Count = 1 (odd): Sum = 0. Count becomes 2.
    • Count = 2 (even): Sum = 0 + 2 = 2. Count becomes 3.
    • Count = 3 (odd): Sum = 2. Count becomes 4.
    • Count = 4 (even): Sum = 2 + 4 = 6. Count becomes 5.
    • Count = 5 (odd): Sum = 6. Count becomes 6.
    • Count = 6 (even): Sum = 6 + 6 = 12. Count becomes 7.
    • Count = 7 (odd): Sum = 12. Count becomes 8.
    • Count = 8 (even): Sum = 12 + 8 = 20. Count becomes 9.
    • Count = 9 (odd): Sum = 20. Count becomes 10.
    • Count = 10 (even): Sum = 20 + 10 = 30. Count becomes 11.
    • Count = 11 (odd): Sum = 30. Count becomes 12.
    • Count = 12: Loop terminates. The output is $\boxed{\text{30}}$.

• b) Differentiate between object-oriented programming and web scripting language:

  • Object-Oriented Programming (OOP) is a programming paradigm that structures software design around data, or objects, rather than functions and logic. It uses concepts like encapsulation, inheritance, and polymorphism to create modular and reusable code for various types of applications.
  • A web scripting language is a programming language primarily used to add dynamic and interactive functionality to websites. These languages can run on the client-side (in the user's web browser, like JavaScript) or on the server-side (on the web server, like PHP or Python) to generate dynamic web content.