School / Cambridge IGCSE / 0478 / Algorithms, programming and logic Practice set under review
Algorithms, programming and logic Pseudocode, validation and testing for Paper 2.
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Computer Science Algorithms, programming and logic
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1 Write pseudocode that repeatedly inputs a test score until the value is between 0 and 100 inclusive, then outputs ‘valid’. Use a post-test or pre-test loop. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 2 A program calculates delivery charges from parcel weight. Design four test cases covering normal, boundary, invalid and extreme data. State the input and purpose of each case. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 3 Write pseudocode to find and output the largest value in an array of 10 integers called Scores. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 4 The list [5, 2, 8, 1] is sorted into ascending order using a bubble sort. State the list after the first full pass. ✓ Reviewed Paper 2 style Easy 3 marks No calculator + 5 A list of 1,000 names is already sorted alphabetically. Which search algorithm will generally find a specific name fastest? A Linear search B Binary search C Bubble sort D Insertion sort ✓ Reviewed Paper 2 style Easy 1 marks No calculator + 6 Write pseudocode using nested IF statements that outputs a grade for a given Score: 'A' if the score is 90 or above, 'B' if it is 75 or above but below 90, and 'C' otherwise. ✓ Reviewed Paper 2 style Easy 3 marks No calculator + 7 Explain one advantage of using a function (subroutine) rather than repeating the same code several times in a program. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 8 A form asks a user to enter their age as a whole number between 1 and 120. Identify two different validation checks that could be applied, and explain what each one checks for. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 9 A loop runs the pseudocode 'Count ← Count + 1' three times, starting with Count = 0. Complete a trace table showing the value of Count after each of the three iterations. ✓ Reviewed Paper 2 style Easy 3 marks No calculator + 10 Write pseudocode to calculate and output the average of 5 numbers stored in an array called Marks. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 11 Explain the difference between a variable and a constant in a program. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 12 Explain why a 2D array would be a suitable data structure to store the seating plan of a cinema with rows and columns of seats. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 13 Explain what the string length function would return when applied to the text 'Cambridge', and give one reason a programmer might need this value. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 14 Distinguish between a count-controlled loop and a condition-controlled loop, using an example of when each would be appropriate. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 15 The list [8, 3, 6, 1] is sorted into ascending order using an insertion sort. State the list after the algorithm has correctly inserted the second element (3) into its sorted position among the first two elements. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 16 Write pseudocode for a linear search that looks for a Target value in an array called Items, and outputs whether the value was found. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 17 Explain what a decision (diamond-shaped) symbol represents in a flowchart. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 18 Write pseudocode to count how many values in an array called Scores are greater than 50. ✓ Reviewed Paper 2 style Medium 4 marks No calculator + 19 Explain one advantage of writing a procedure that accepts parameters, rather than one that always works on fixed, built-in values. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 20 A form requires a user to enter their name. Explain what a presence check would do, and why it is needed for this field. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 21 A system requires a new password to be at least 8 characters long. Explain what a length check would do when this password is entered. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 22 Explain, in simple terms, what it means for a function to be recursive, using a function that calculates factorials as an example. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 23 Explain one feature of an Integrated Development Environment (IDE) that helps a programmer write code with fewer errors. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + 24 Explain the purpose of using meaningful variable names, such as 'studentAge' instead of 'x', when writing a program. ✓ Reviewed Paper 2 style Easy 2 marks No calculator + Self-assessed 0 / 0
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