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Mini-Quiz (6–8 min) — Week 2: Procedures, Parameters, Boolean Logic

Based on: Week 1 self-study (AP Daily: variables, conditionals, loops, procedures, lists) and Week 1 in-class work

Instructions

• No notes. Show your reasoning. Time: 6–8 minutes.

1. Define and call a procedure with a parameter (AP pseudocode) Write a procedure greet(name) that DISPLAYs “Hello, “ + name + “!” and show how to call it for the name “Ada”.

Answer

PROCEDURE greet(name)
  DISPLAY("Hello, " + name + "!")
END PROCEDURE

# Call
greet("Ada")

Explanation: PROCEDURE defines a named block; parameter name receives the argument “Ada”.

1. Return vs DISPLAY (what is printed?) What is displayed by the following?

PROCEDURE add(x, y)
  RETURN x + y
END PROCEDURE

PROCEDURE add_and_show(x, y)
  DISPLAY(x + y)
END PROCEDURE

DISPLAY( add(2, 3) )
result ← add_and_show(2, 3)
DISPLAY(result)

Answer

• add(2,3) returns 5 → DISPLAY prints 5.
• add_and_show(2,3) DISPLAYs 5 but RETURNS nothing (no value) → result gets null.
• DISPLAY(result) prints null.

Output (in order): 5, 5, null.

1. Boolean logic (truth table reasoning) Evaluate each expression (true/false) given x ← 4, y ← 7.

a) (x < 5) AND (y = 7) b) (x ≥ 4) OR (y < 0) c) NOT(x = 4)

Answer

a) true AND true → true b) true OR false → true c) NOT(true) → false

1. Input validation (REPEAT UNTIL) Write AP pseudocode that repeats INPUT() until the user enters a number from 1 to 5 (inclusive). When valid, DISPLAY(“OK”).

Answer

REPEAT
  SET n ← INPUT()
UNTIL (n ≥ 1) AND (n ≤ 5)
DISPLAY("OK")

Notes: AP pseudocode treats INPUT() as text; range check shown conceptually.

1. Parameter vs argument (short response) In 1–2 sentences, define parameter vs argument and give one example from Q1.

Answer

A parameter is the variable in a procedure definition (e.g., name in PROCEDURE greet(name)). An argument is the actual value passed at the call site (e.g., “Ada” in greet(“Ada”)).

1. Lists (indexing is 1-based in AP pseudocode) Given L ← [“A”,”B”,”C”,”D”], answer: a) What does DISPLAY(L[3]) show? b) Write AP pseudocode to DISPLAY every item in L, one per line.

Answer

a) “C” — AP pseudocode is 1-based (L[1]=”A”, L[2]=”B”, L[3]=”C”). b)

FOR EACH item IN L
  DISPLAY(item)
END FOR EACH

Notes: FOR EACH iterates elements directly; no index math needed.