3.1. Data representation
A subsection of Computer Science, 9608, through 3. Advanced Theory
Listing 10 of 43 questions
A particular programming language allows the programmer to define their own data types. An example of a user-defined data type for an address is: TYPE ThisAddress DECLARE ThisHouseNo : INTEGER DECLARE ThisStreet : STRING DECLARE ThisTown : STRING ENDTYPE A variable of this new type is declared as follows: DECLARE HomeAddress : ThisAddress Write the statement that assigns the house number 34 to HomeAddress. The type definition for ThisAddress is to be changed. Rewrite one line from the definition for each of the following changes. House numbers are in the range from 1 to 10. DECLARE The possible towns are limited to: Brightown, Arunde and Shoram. DECLARE Temperature data from a number of weather stations are to be processed by a program. The following data are to be stored: • weather station ID (a unique four-letter code) • latitude (to 2 decimal places) • average temperature (to the nearest whole number) for each year from 2001 to 2015 inclusive A programmer designs a composite data type WeatherStation. A variable of this type can be used to store all the data for one particular station. Write the definition for the user-defined data type WeatherStation. The programmer decides to store all the data in a file. The number of weather stations could grow to reach 20000, but not all stations will be present at first. The programmer decides on random organisation for the file. Describe three steps which show how a new weather station record is added to the file.
9608_s15_qp_33
THEORY
2015
Paper 3, Variant 3
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Consider the following user‑defined data type. TYPE Book DECLARE ISBN : INTEGER DECLARE Author : STRING DECLARE Title : STRING DECLARE Supplier : (Amazone, Stones, Smiths, Blackwalls, Greens, Coals, Boarders) ENDTYPE Name the data type of Book. Name the non‑composite data type used in the Supplier declaration. Write a pseudocode statement to declare a variable, BestSeller, of type Book. Write a pseudocode statement to assign “John Williams” to the author of BestSeller.
9608_w18_qp_31
THEORY
2018
Paper 3, Variant 1
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Consider the following user‑defined data type. TYPE Book DECLARE ISBN : INTEGER DECLARE Author : STRING DECLARE Title : STRING DECLARE Supplier : (Amazone, Stones, Smiths, Blackwalls, Greens, Coals, Boarders) ENDTYPE Name the data type of Book. Name the non‑composite data type used in the Supplier declaration. Write a pseudocode statement to declare a variable, BestSeller, of type Book. Write a pseudocode statement to assign “John Williams” to the author of BestSeller.
9608_w18_qp_33
THEORY
2018
Paper 3, Variant 3
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Explain why user-defined data types are necessary. An organisation stores data about its employees. • Employee ID is a five-digit number, for example, 01234. • Employee name is a string, for example, ‘Kiri Moana’. • Department is one of three values: Sales, Technical, Customer services. • Salary is an integer value in the range 25 000 to 150 000. Complete the following pseudocode definition of a user-defined data type to store the employee data. TYPE Employee DECLARE EmployeeID : DECLARE EmployeeName : STRING DECLARE Department : ( ) DECLARE Salary : 25000 150000 Write a pseudocode statement to declare a variable, NewEmployee of data type Employee. Write a pseudocode statement that assigns 02244 to the EmployeeID of NewEmployee. Employee is an example of a record that is a composite data type. State two other composite data types.
9608_w19_qp_31
THEORY
2019
Paper 3, Variant 1
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State what is meant by a user-defined data type. A pseudocode declaration for a user-defined data type for the months of the year is as follows: TYPE DECLARE Months: ( January, February, March, April, May, June, July, August, September, October, November, December) ENDTYPE Identify this type of user-defined data type. Write a pseudocode statement to declare a variable CurrentMonth of data type Months. Write a pseudocode statement to assign the value August to the variable CurrentMonth.
9608_w19_qp_32
THEORY
2019
Paper 3, Variant 2
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Explain why user-defined data types are necessary. An organisation stores data about its employees. • Employee ID is a five-digit number, for example, 01234. • Employee name is a string, for example, ‘Kiri Moana’. • Department is one of three values: Sales, Technical, Customer services. • Salary is an integer value in the range 25 000 to 150 000. Complete the following pseudocode definition of a user-defined data type to store the employee data. TYPE Employee DECLARE EmployeeID : DECLARE EmployeeName : STRING DECLARE Department : ( ) DECLARE Salary : 25000 150000 Write a pseudocode statement to declare a variable, NewEmployee of data type Employee. Write a pseudocode statement that assigns 02244 to the EmployeeID of NewEmployee. Employee is an example of a record that is a composite data type. State two other composite data types.
9608_w19_qp_33
THEORY
2019
Paper 3, Variant 3
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Data types can be classified as composite or non-composite. Draw one line from each data type to its correct classification. Classification Composite Non-composite Pointer Data type Record Set Class Integer A user-defined data type, timeOfDay, is declared using the following pseudocode. TYPE timeOfDay = (morning, afternoon, evening, night) Identify the type of user-defined data type declared and state its classification. Type Classification Write pseudocode to declare the variable session of type timeOfDay. Assign the value afternoon to the variable session.
9608_w20_qp_32
THEORY
2020
Paper 3, Variant 2
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Data types can be classified as composite or non-composite. A record is declared of type box using the following pseudocode. TYPE size = (small, medium, large) TYPE box DECLARE volume : size DECLARE price : REAL DECLARE colour : STRING ENDTYPE DECLARE myBox : ARRAY [1:6] OF box Identify one composite and three non-composite data types used in the pseudocode. Composite data type Non-composite data type 1 Non-composite data type 2 Non-composite data type 3 Identify the data type in the pseudocode that is enumerated. A box is red, with medium volume and a price of $10.99. Write pseudocode to store the details of this box in the first element of the array.
9608_w20_qp_31
THEORY
2020
Paper 3, Variant 1
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Questions Discovered
43