Constructs: past paper questions

Where the questions come from

• Question 1May/June 2026, paper 21Structured2 marks

  Study this pseudocode: FOR i ← 3 TO 12 STEP 3 OUTPUT i, i * i NEXT i Identify the type of construct used in this pseudocode.

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• Question 5Oct/Nov 2025, paper 21Structured6 marks

  A program is being designed in pseudocode.

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• Question 1Oct/Nov 2024, paper 21Structured9 marks

  Refer to the insert for the list of pseudocode functions and operators. 1 A program will calculate the tax payable based on the cost of an item.

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• Question 1Oct/Nov 2023, paper 21Structured11 marks

  Refer to the insert for the list of pseudocode functions and operators.

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• Question 2May/June 2026, paper 21Structured7 marks

  A washing machine contains: • two trays for the washing powder • a user interface display • five sensors.

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• Question 1Oct/Nov 2025, paper 22Structured11 marks

  Refer to the insert for the list of pseudocode functions and operators. The table contains pseudocode examples. Each example may contain statements that relate to one or more of: • selection • iteration (repetition) • subroutines (procedures or functions).

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• Question 2Oct/Nov 2024, paper 21Structured6 marks

  2 A program uses three global integer variables HH, MM and SS to represent the current time in hours, minutes and seconds using the 24-hour clock notation. Midnight would be represented as 00:00:00 (HH:MM:SS).

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• Question 2Oct/Nov 2023, paper 21Structured7 marks

  An algorithm is expressed as follows: • input 100 numbers, one at a time • keep a total of all numbers input that have a value between 30 and 70 inclusive and output this total after the last number has been input.

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• Question 5May/June 2026, paper 21Structured5 marks

  Electric light bulbs are advertised online with the price showing: $1.75 each or 20 bulbs for $30.00 A pseudocode function BulbCost() • takes the quantity of bulbs purchased as its single parameter • returns the total cost in dollars.

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• Question 2Oct/Nov 2025, paper 23Structured8 marks

  A program contains a global 1D array of type STRING containing 65 elements. An existing text file is used to store the data in the array. Only non-blank elements (those that do not contain an empty string) are written to the text file.

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• Question 6Oct/Nov 2024, paper 21Structured9 marks

  6 A factory produces food items. The items must be used within a certain number of days after their production date. The number of days is known as the shelf life.

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• Question 2Oct/Nov 2023, paper 22Structured7 marksHas a diagram

  An algorithm will: 1. input a sequence of integer values, one at a time 2. ignore all values until the value 27 is input, then sum the remaining values in the sequence 3.

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• Question 6May/June 2026, paper 22Structured18 marks

  6 A program is being developed to encrypt a message. The following terms are used in the encryption technique to be used: | term | definition | |---|---| | plain text | The original message before it is encrypted. | | cipher text | The encrypted version of the plain text.

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• Question 5Oct/Nov 2025, paper 23Structured8 marks

  A global 1D array Num of integers contains four elements. A program assigns values to these elements as shown: Num[1] ← 1 Num[2] ← 2 Num[3] ← 5 Num[4] ← 3 A procedure Process() manipulates the values in the array.

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• Question 2Oct/Nov 2024, paper 22Structured9 marks

  A program is being developed to process bank card information. When a card number is displayed, all the characters except the last four are replaced with the asterisk character '*'. Card numbers are stored as strings.

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• Question 4Oct/Nov 2023, paper 22Structured9 marks

  A procedure Count() will: 1. input a value (all values will be positive integers) 2. count the number of odd values and count the number of even values 3.

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• Question 1May/June 2026, paper 23Structured2 marks

  Refer to the insert for the list of pseudocode functions and operators. Study the pseudocode. i ← 1 REPEAT OUTPUT i*i i ← i + 1 UNTIL i = 6 Identify the type of programming construct used in the pseudocode.

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• Question 1May/June 2025, paper 21Structured12 marks

  Refer to the insert for the list of pseudocode functions and operators. 1 A program is being developed to help the manager of a shop control the stock. An identifier table has been used during the design stage.

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• Question 4Oct/Nov 2024, paper 22Structured6 marks

  A global integer variable Tick is always incremented every millisecond (1000 times per second) regardless of the other programs running. The value of Tick can be read by any program but the value should not be changed. Assume that the value of Tick does not overflow.

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• Question 4Oct/Nov 2023, paper 23Structured7 marks

  A procedure RandList() will output a sequence of 25 random integers, where each integer is larger than the previous one. Write pseudocode for procedure RandList().

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• Question 3May/June 2025, paper 21Structured8 marks

  A student has been asked to create a simple guessing game program. This program will generate a random integer value between 1 and 100. It will then repeatedly prompt the user to input an integer value until they input the randomly generated value.

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• Question 5Oct/Nov 2024, paper 22Structured7 marks

  A program contains a global 1D array Data with 100 elements of type INTEGER.

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• Question 6Oct/Nov 2023, paper 23Structured6 marks

  A function TestNum() will take a six-digit string as a parameter.

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• Question 3May/June 2025, paper 22Structured8 marks

  An algorithm is designed to generate and output two unique random integers. Each integer value is between –10 and 10 inclusive. If both integers output are negative, a third random integer between 30 and 35 inclusive will be generated and output.

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• Question 1Oct/Nov 2024, paper 23Structured10 marks

  Refer to the insert for the list of pseudocode functions and operators. The following table contains pseudocode examples. Each example may contain statements that relate to one or more of the following: • selection • iteration (repetition) • subroutine (procedure or function).

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• Question 8Oct/Nov 2023, paper 23Structured20 marks

  A class of students are developing a program to send data between computers. Many computers are connected together to form a wired network. Serial ports are used to connect one computer to another.

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• Question 5May/June 2025, paper 23Structured8 marks

  A module Parity() takes a string as a parameter. The parameter has the identifier BitString and it represents a binary value.

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• Question 2Oct/Nov 2024, paper 23Structured7 marks

  An algorithm will: 1. prompt and input a sequence of 100 integer values, one at a time 2. sum the positive integers 3.

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• Question 4May/June 2023, paper 21Structured6 marks

  Function Replace() will: 1. take three parameters: • a string (the original string) • a char (the original character) • a char (the new character) 2. form a new string from the original string where all instances of the original character are replaced by the new character 3.

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• Question 2May/June 2024, paper 21Structured7 marksHas a diagram

  An algorithm has three steps. It will: 1. repeatedly input a pair of numeric values A and B 2.

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