Study the following pseudocode. FUNCTION Double(N : INTEGER) RETURNS INTEGER RETURN N * 2 ENDFUNCTION FUNCTION AddThree(N : INTEGER) RETURNS INTEGER ...

Assessment: Computer Science 0478 | Paper 2 Mock 01 | Algorithms, Programming and Logic Subject: Computer Science - 0478

Question 1 Report

Study the following pseudocode.

FUNCTION Double(N : INTEGER) RETURNS INTEGER
    RETURN N * 2
ENDFUNCTION

FUNCTION AddThree(N : INTEGER) RETURNS INTEGER
    RETURN N + 3
ENDFUNCTION

DECLARE A : INTEGER
DECLARE B : INTEGER
A ← 4
B ← Double(A)
A ← AddThree(B)
B ← Double(AddThree(A))
OUTPUT A, " ", B

(a) State the output. [1]

Answer Details

(a) This question tests the ability to trace through nested function calls. [1]

Step-by-step evaluation:

  1. A ← 4
  2. B ← Double(4): the function returns 4 * 2 = 8, so B = 8
  3. A ← AddThree(8): the function returns 8 + 3 = 11, so A = 11
  4. B ← Double(AddThree(11)): first evaluate the inner call, AddThree(11) = 14; then Double(14) = 28, so B = 28

OUTPUT: 11 28 [1]

Read lesson note on Algorithm Design And Problem-solving (CIE)
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