Programming concepts

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Question 18

An oceanic research vessel uses a coordinate grid system to map marine wildlife sightings. The grid layout is divided into 3 columns (X, Y, and Z) and 5 rows (1, 2, 3, 4, and 5) as shown in Figure 1.

Figure 1

	X	Y	Z
1
2		[Sighting]
3
4
5

Figure 2

valid = False
while valid == False:
    sector = ""
    while len(sector) != 2:
        sector = input("Enter research sector ID (e.g. Y3): ")
        sector = sector.upper()

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

Your extended program must:

use the variable valid
check that the first character of the string sector is a valid column letter (X, Y, or Z)
check that the second character of the string sector is a valid row number (1, 2, 3, 4, or 5)
change the value of valid to True if both checks are met
output an appropriate error message if any part of the sector identifier is invalid.

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

[6]

Figure 1

	X	Y	Z
1
2		[Sighting]
3
4
5

Figure 2

valid = False
while valid == False:
    sector = ""
    while len(sector) != 2:
        sector = input("Enter research sector ID (e.g. Y3): ")
        sector = sector.upper()

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

Your extended program must:

use the variable valid
check that the first character of the string sector is a valid column letter (X, Y, or Z)
check that the second character of the string sector is a valid row number (1, 2, 3, 4, or 5)
change the value of valid to True if both checks are met
output an appropriate error message if any part of the sector identifier is invalid.

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

Programming concepts

Question 18

Figure 1

Figure 2

Markscheme

Programming concepts

Question 18

Figure 1

Figure 2

Markscheme

Programming concepts

Question 18

Figure 1

Figure 2

Programming concepts Questions

Programming concepts

Question 18

Figure 1

Figure 2

Programming concepts Questions