A-LevelComputer ScienceProgramming9618/41 · May/June 2023 · Q118 Marks

A program reads data from a file and searches for specific data.

(a)(i)Write program code to declare the local array DataArray[1]
(a)(ii)Amend the main program to read the contents of Data.txt into DataArray[4]
(b)(i)The procedure PrintArray() takes an integer array as a parameter and outputs the contents of the array in the order they are stored. The items are printed on the same line, for example: 10 4 5 13 25 Write program code for the procedure PrintArray()[3]
(b)(ii)Amend the main program to output the contents of DataArray using the procedure PrintArray()[1]
(b)(iii)Test your program. Take a screenshot of the output.[1]
(c)The function LinearSearch(): • takes an integer array and integer search value as parameters • counts and returns the number of times the search value is found in the array. Write program code for the function LinearSearch()[3]
(d)(i)Amend the main program to: • prompt the user to input a whole number between 0 and 100 inclusive • read and validate the input from the user • call LinearSearch() with DataArray and the validated input value • output the result in the format: The number 7 is found 2 times. Write program code for the main program.[4]
(d)(ii)Test your program by inputting the number 12. Take a screenshot of the output.[1]

Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

[1] 1 mark for • 1D array with name DataArray (with 25 elements of type Integer)
[4] 1 mark each to max 4 • Opening file Data.txt to read • Looping through all the 25/EOF • reading each line and storing/appending into array • Exception handling with appropriate output • Closing the file (in an appropriate place)
[3] 1 mark each • Procedure header (and close where appropriate) with (at least) one (integer array) parameter • Outputting all (25) array elements • ...on one line
[1] 1 mark for calling PrintArray with the array as a parameter
[1] 1 mark for screenshot e.g. 10 4 5 13 25 31 4 66 12 5 0 11 15 20 21 12 33 49 12 12 7 7 4 22 0
[3] 1 mark each • Function header (and close where appropriate) taking array and search value as parameters • Looping through each array element and keeping count of the number of times the parameter appears • Returning the calculated count value
[4] 1 mark each • Prompt and reading input • .with validation for whole number between 0 and 100 inclusive • Calling LinearSearch() with array and valid data input and storing/using return value • Output of the message with return value
[1] 1 mark for screenshot e.g. 10 4 5 13 25 31 4 66 12 5 0 11 15 20 21 12 33 49 12 12 7 7 4 22 Enter a number to find 12 The number 12 is found 4 times

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