A-LevelComputer ScienceProgramming9618/41 · Oct/Nov 2022 · Q123 Marks

The text file IntegerData.txt stores 100 integer numbers between 1 and 100 inclusive. A program is required to read in this data and perform searching and sorting on the data.

(a)Write program code to declare a global 1D array, DataArray, with space for 100 integer values.[2]
(b)The procedure ReadFile() must read in the numbers from the text file and store each one in the array. Use appropriate exception handling. Write program code for the procedure ReadFile().[6]
(c)The function FindValues() asks the user to enter a number to search for in the array. The number input must be a whole number between 1 and 100 inclusive. The function then returns the number of times the number input appears in the array. Write program code for the function FindValues().[7]
(d)(i)Write program code to call ReadFile() and FindValues() from the main program. The return value from FindValues() must be output with an appropriate message.[3]
(d)(ii)Test your program using the number 61 as input. Take a screenshot to show the output. Copy and paste the screenshot into part 1(d)(ii) in the evidence document.[1]
(e)The procedure BubbleSort() needs to perform a bubble sort on the array and print the contents of the sorted array. Write program code for the procedure BubbleSort() and call it from the main program.[4]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

1 mark per point:
[1] (global) 1D (Integer) array DataArray
[1] 100 elements
1 mark per point:
[1] Procedure ReadFile() header (and end where appropriate)
[1] opening file IntegerData.txt (for read)
[1] looping through the 100 elements // looping to end of file
[1] reading each (and all) value from file and storing in array
[1] closing file (in appropriate place)
1 mark per point:
[1] Exception Handling (for opening the file, or for reading values from the file)...
[1] ...with appropriate catch and output messages
1 mark per point:
[1] Function FindValues()(and end where appropriate) and input of data to search for in the array
[1] ...validation/casting(/storing as) of input as integer
[1] .validation of input between 1 and 100 (inclusive)
[1] looping through all 100 array elements...
[1] .comparing input to each array element...
[1] .initialising counter to 0 and then adding 1 each time it is found...
[1] Returning the total
1 mark per point:
[1] Calling ReadFile() and then FindValues() (in the main program)
[1] storing/using return value from FindValues()
[1] ...outputting return value with appropriate message
[1] Screenshot showing 61 input and 2 output, e.g.
1 mark per point:
[1] procedure declaration (and end where appropriate) and outputting array contents at end of procedure and calling procedure from main program
[1] correct outer loop
[1] correct inner loop ...
[1] swapping all elements if in incorrect order

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