A programmer is writing a game - AQA - GCSE Computer Science - Question 13 - 2023 - Paper 1
Question 13
A programmer is writing a game. The game uses a 3 x 3 grid containing nine squares.
In the game, a square on the grid is referred to by a letter and a number. For e... show full transcript
Worked Solution & Example Answer:A programmer is writing a game - AQA - GCSE Computer Science - Question 13 - 2023 - Paper 1
Step 1
Use the variable check
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Answer
I will declare a variable named check and initialize it to False. This variable will be used to control the loop for valid grid reference input.
Step 2
repeat the input until a valid grid reference is entered
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Answer
I will construct a while loop that continues as long as check is False. Inside this loop, I will prompt the user to enter a grid reference.
Step 3
get the user to enter a grid reference
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Answer
Within the loop, I will use input() to ask the user for their grid reference and store it in the variable square. I will then convert square to uppercase using square.upper().
Step 4
output an appropriate message if the grid reference is not valid
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Answer
I will implement checks using if statements to validate the input format. I will check:
if the length of square is not equal to 2, I will print 'Invalid input: must be 2 characters.'
if the first character is not in 'ABC', I will print 'Invalid column: must be A, B, or C.'
if the second character is not in '123', I will print 'Invalid row: must be 1, 2, or 3.'
If all checks pass, I will set check to True.
