How to Answer Programming Questions (OCR GCSE Computer Science): Revision Note

Charlie is developing an adding game. The rules of the game are:

• the player is asked 3 addition questions

• each question asks the player to add together two random whole numbers between 1 and 10 inclusive

• if the player gets the correct answer, 1 is added to their score

• at the end of the game their score is displayed.

Write an algorithm to play this game.

[6 marks]

What are the inputs? What are the outputs? What processes take place?

• the player is asked 3 addition questions

• each question asks the player to add together two random whole numbers between 1 and 10 inclusive

• if the player gets the correct answer, 1 is added to their score

• at the end of the game their score is displayed.

What constructs will I need to use?

• Iteration - a FOR loop can be used as the game is a fixed length (3 questions)

• Selection - an IF statement can be used to check if the answer is correct

• Declare a score variable to keep track of the score

Do I need to use subprograms?

• This program can be written without the need to use a subprogram (function or procedure)

Answer

Pseudocode

score = 0

for count = 1 to 3

num1 = random(1, 10)

num2 = random(1, 10)

ans = input("What is” +num1 + " + " + num2 + "?")

if ans = num1 + num2 then

score = score + 1

end if

next count

print("You scored " + score)

A program written in a high-level language is used to access data from a database.

This program has a procedure, SaveLogs(), that stores the data to an external text file.

The procedure SaveLogs():

• takes the string of data to be stored to the text file as a parameter

• takes the filename of the text file as a parameter

• stores the string of data to the text file.

Write the procedure SaveLogs()

You must use either:

• OCR Exam Reference Language, or

• A high-level programming language that you have studied

[6 marks]

What are the inputs? What are the outputs? What processes take place?

• takes the string of data to be stored to the text file as a parameter

• takes the filename of the text file as a parameter

• stores the string of data to the text file.

Write the procedure SaveLogs()

What constructs will I need to use?

• This question is testing knowledge of how to write procedures

• Selection must be used to ensure the correct order of operations

• No selection or iteration is required

Do I need to use subprograms?

• This question requires the answer written as a procedure which includes 2 x parameters

• A procedure does not return a value

Answer

Pseudocode

procedure SaveLogs(data, filename)

logFile = open(filename)

logFile.writeLine(data)

logFile.close()

endprocedure