Programming concepts

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Question 44

An autonomous marine research buoy network uses a grid coordinate system to track its deployment stations. The station layout is a 3x5 grid as shown in Figure 1.

Figure 1

	X	Y	Z
5
6		[Buoy]
7
8
9

Figure 2

valid = False
while valid == False:
    ref = ""
    while len(ref) != 2:
        ref = input("Enter buoy station reference (e.g. Y6): ")
        ref = ref.upper()

Extend the Python program in Figure 2 so that it completes the validation checks and matches the coordinate layout in Figure 1.

Your extended program must:

use the variable valid
check that the first character of the code is a valid column letter (X, Y, or Z)
check that the second character of the code is a valid row number (5, 6, 7, 8, or 9)
change the value of valid to True if both checks are met
output an appropriate error message if any part of the coordinate code is invalid.

You should write Python code or precise pseudocode in your answer.

[6]

An autonomous marine research buoy network uses a grid coordinate system to track its deployment stations. The station layout is a 3x5 grid as shown in Figure 1.

Figure 1

	X	Y	Z
5
6		[Buoy]
7
8
9

Figure 2

valid = False
while valid == False:
    ref = ""
    while len(ref) != 2:
        ref = input("Enter buoy station reference (e.g. Y6): ")
        ref = ref.upper()

Extend the Python program in Figure 2 so that it completes the validation checks and matches the coordinate layout in Figure 1.

Your extended program must:

use the variable valid
check that the first character of the code is a valid column letter (X, Y, or Z)
check that the second character of the code is a valid row number (5, 6, 7, 8, or 9)
change the value of valid to True if both checks are met
output an appropriate error message if any part of the coordinate code is invalid.

You should write Python code or precise pseudocode in your answer.

Programming concepts

Question 44

Figure 1

Figure 2

Markscheme

Programming concepts

Question 44

Figure 1

Figure 2

Markscheme

Programming concepts

Question 44

Figure 1

Figure 2

Programming concepts Questions

Programming concepts

Question 44

Figure 1

Figure 2

Programming concepts Questions