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
Extend the program from Figure 15
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Answer
# Initializing the check variable
check = False
while not check:
square = ""
# Loop for obtaining valid reference input
while len(square) != 2:
square = input("Enter grid reference (eg C2): ")
square = square.upper()
# Extract the characters
row = square[1]
col = square[0]
valid_columns = ['A', 'B', 'C']
valid_rows = ['1', '2', '3']
# Check conditions for validity
if col in valid_columns and row in valid_rows:
check = True # Valid grid reference
else:
print("Invalid grid reference. Please enter again.")
Step 2
Use the variable check
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Answer
The variable check is utilized to control the loop, ensuring the program keeps asking for input until a valid reference is provided.
Step 3
Repeat the input until a valid grid reference is entered
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The outer while loop continues until check is set to True, indicating that a valid reference has been entered.
Step 4
Get the user to enter a grid reference
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Answer
Within the loop, the program prompts the user for input using the input function.
Step 5
Ensure that the appropriate message is displayed if the grid reference entered is not valid
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An error message is printed in the else clause if the entered reference doesn't match the valid options.
