0478_s23_qp_21
A paper of Computer Science, 0478
Questions:
11
Year:
2023
Paper:
2
Variant:
1
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1
Four descriptions of stages in the program development life cycle are shown. Draw one line to link each description to its most appropriate program development life cycle stage. Not all program development life cycle stages will be used. Program development life cycle description Program development life cycle stage develop an algorithm to solve the problem by using structure diagrams, flowcharts or pseudocode analysis coding design evaluation testing detect and fix the errors in the program identify the problem and its requirements write and implement the instructions to solve the problem Identify three of the component parts after a problem has been decomposed.
7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving
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3
Describe what is meant by data validation. A validation check is used to make sure that any value that is input is an integer between 30 and 200 inclusive. Give one example of each type of test data to check that the validation check is working as intended. Each example of test data must be different. Give a reason for each of your choices of test data. Normal test data Reason Abnormal test data Reason Extreme test data Reason
7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving
2. Data transmission  →  2.2. Methods of error detection
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5
An algorithm has been written in pseudocode to allow some numbers to be input. All the positive numbers that are input are totalled and this total is output at the end. An input of 0 stops the algorithm. 01 Exit ← 1 02 WHILE Exit <> 0 DO 03 INPUT Number 04 IF Number Correction Error 2 Correction Error 3 Correction Error 4 Correction Describe how you could change the corrected algorithm to record and output how many positive numbers have been included in the final total. You do not need to rewrite the algorithm.
7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving
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7
The flowchart represents an algorithm. START INPUT Letter INPUT Choice OUTPUT "Another Letter? (Y or N)" OUTPUT "Letter ", Letter, " is represented by ", Word[Pointer, 2] IS Choice = 'Y' ? IS Word[Pointer, 1] = Letter ? STOP Pointer 1 Pointer Pointer + 1 Yes Yes No No The table represents the two-dimensional (2D) array Word[] which stores the first half of the phonetic alphabet used for radio transmission. For example, Word[10,1] is ‘J’. Index A Alpha B Bravo C Charlie D Delta E Echo F Foxtrot G Golf H Hotel I India J Juliet K Kilo L Lima M Mike Complete the trace table for the algorithm by using the input data: F, Y, D, N Pointer Letter Choice OUTPUT Identify the type of algorithm used. Describe one problem that could occur with this algorithm if an invalid character was input.
7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving
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10
A database table called TVRange shows the main features and prices of a range of televisions. TVCode ScreenSize Satellite SmartTV SoundBar Price$ TV90SaSmSd YES YES YES 9750.00 TV75SaSmSd YES YES YES 8500.00 TV75SaSd YES NO YES 8000.00 TV65SaSmSd YES YES YES 6000.00 TV65SmSd NO YES YES 5000.00 TV65SaSd YES NO YES 5000.00 TV55SaSmSd YES YES YES 4000.00 TV55SaSd YES NO YES 3500.00 TV55SmSd NO YES YES 3500.00 TV50SaSmSd YES YES YES 2500.00 TV50Sa YES NO NO 1750.00 TV50Sm NO YES NO 1750.00 TV40Sa YES NO NO 1200.00 TV40 NO NO NO 950.00 TV32 NO NO NO 650.00 Give the name of the field that is most suitable to be the primary key. State the reason for this choice. Field Reason The database uses the data types: • text • character • Boolean • integer • real • date/time. Complete the table to show the most appropriate data type for each field. Each data type must be different. Field Data type TVCode ScreenSize SmartTV Price$ Complete the structured query language (SQL) query to return the television (Tcode, screen size and price of all Smart TVs in the database table. SELECT TVCode, , TVRange WHERE SmartTV = ;
9. Databases  →  9. Databases
8. Programming  →  8.1. Programming concepts
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11
A one-dimensional (1D) array Days[] contains the names of the days of the week. A two-dimensional (2D) array Readings[] is used to store 24 temperature readings, taken once an hour, for each of the seven days of the week. A 1D array AverageTemp[] is used to store the average temperature for each day of the week. The position of any day’s data is the same in all three arrays. For example, if Wednesday is in index 4 of Days[], Wednesday’s temperature readings are in index 4 of Readings[] and Wednesday’s average temperature is in index 4 of AverageTemp[] The temperature readings are in Celsius to one decimal place. Temperatures can only be from –20.0 °C to +50.0 °C inclusive. Write a program that meets the following requirements: • input and validate the hourly temperatures for one week • calculate and store the average temperature for each day of the week • calculate the average temperature for the whole week • convert all the average temperatures from Celsius to Fahrenheit by using the formula Fahrenheit = Celsius * 9 / 5 + 32 • output the average temperature in Celsius and in Fahrenheit for each day • output the overall average temperature in Celsius and in Fahrenheit for the whole week. You must use pseudocode or program code and add comments to explain how your code works. You do not need to declare any arrays, variables or constants; you may assume that this has already been done. All inputs and outputs must contain suitable messages. All data output must be rounded to one decimal place. You will need to initialise and populate the array Days[] at the start of the program.
7. Algorithm design and problem-solving  →  7. Algorithm design and problem-solving
8. Programming  →  8.2. Arrays
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