IGCSE(0478)Paper 2 Test Challenge

Tick (✓) one box to show which task is part of the analysis stage of the program life cycle.

• coding

• decomposition

• design

• testing

(a) Four test data types and five descriptions are shown. Draw one line to link each test data type to its most appropriate description.

(b) An algorithm has been written to test if an integer that is input is in the range 5 to 10 inclusive. Identify an example of suitable test data for each test data type.

A linear search and a bubble sort are standard methods of solution. Fifty numbers are already stored in the array Values[1:50]. Write an algorithm in pseudocode to input a number, MyNumber, and use a linear search to test if that number is stored in the array. If the number is found in the array, the position in the array is output. If the number is not found in the array, "Not found" is output.

Write an algorithm in pseudocode to sort the array Values[1:50] into ascending order using a bubble sort.

Identify three data types used in programming.

Identify the line numbers of three errors in the pseudocode and suggest corrections.

This algorithm needs to be improved with a range check. Write pseudocode to reject the input of values less than zero for variables Cost and Sell.

Describe two other validation checks that should be included in this algorithm.

Describe two types of iteration that a programmer can use whilst writing a program.