2210/22 · May/June 2025
Download PDFA fence measuring 2 metres in height and 20 metres in length needs painting. The area of the fence needs to be calculated so that enough paint for the job is purchased. After the task is decomposed, there are three component parts: input, process and output. Three component parts and four example descriptions are shown. Draw one line from each component part to the most appropriate relevant description. Not all descriptions will be used.
A range check is used to validate that the input temperature is an integer between –100 and 0, inclusive. Suggest suitable normal, abnormal, extreme and boundary test data to test if this validation check is working correctly. Normal test data ............................................................................................................................... Abnormal test data ........................................................................................................................... Extreme test data ............................................................................................................................. Boundary test data ...........................................................................................................................
State one reason for using a verification check when inputting data.
Write the pseudocode for an algorithm to perform a double entry verification check, using the following criteria: • Input 10 numbers and store them in the array Numbers[] • Input the same 10 numbers again; as each number is input, compare it with its corresponding number in the array Numbers[] ◦ if the numbers match, move on to the next number ◦ if the numbers do not match, display both numbers and ask for the number to be re-entered ◦ store the re-entered number in the corresponding array location and move on to the next number. • When all the numbers have been checked, display a message to say the check has been completed. You do not need to declare any arrays or variables for this algorithm.
This pseudocode algorithm should allow 500 names of people and their heights to be entered and stored in two one-dimensional (1D) arrays. The name of a person and the height of that person are in the same index in both the Names[] and the Heights[] arrays. The algorithm performs as follows: • at the start, the following data is entered: ◦ name of person ◦ height of person in cm • the data is stored in the relevant arrays • the heights of the people are totalled • the shortest person is found • at the end, the following is output: ◦ name of shortest person ◦ height of shortest person ◦ average height of all 500 people. 01 DECLARE Names : ARRAY[1:500] OF REAL 02 DECLARE Heights : ARRAY[1:500] OF REAL 03 DECLARE Shortest : REAL 04 DECLARE Total : REAL 05 DECLARE Counter : INTEGER 06 DECLARE Index : INTEGER 07 Shortest ← 500 08 Index ← 0 09 Total ← 100 10 FOR Counter ← 1 TO 500 11 INPUT Names[Index] 12 INPUT Heights[Counter] 13 Total ← Counter + Heights[Counter] 14 IF Heights[Counter] < Shortest 15 THEN 16 Shortest ← Heights[Counter] 17 Index ← Counter 18 ENDIF 19 NEXT Counter 20 OUTPUT "The shortest height is ", Heights 21 OUTPUT "The shortest person is ", Names[Index] 22 OUTPUT "The average height is ", Total / 500
Identify the line numbers of five errors in the pseudocode and suggest a correction for each error. Error 1 line number .................................. Correction ................................................................................................................................. ................................................................................................................................................... Error 2 line number .................................. Correction ................................................................................................................................. ................................................................................................................................................... Error 3 line number .................................. Correction ................................................................................................................................. ................................................................................................................................................... Error 4 line number .................................. Correction ................................................................................................................................. ................................................................................................................................................... Error 5 line number .................................. Correction ................................................................................................................................. ...................................................................................................................................................
Write the pseudocode statement that will output the average height rounded to one decimal place.
Explain how you could change the corrected algorithm so that it will also: • find the height of the tallest person. • output the height of the tallest person at the end of the algorithm. Any program statements used must be fully explained.
This pseudocode is an algorithm. DECLARE Word : STRING DECLARE V1 : INTEGER DECLARE V2 : INTEGER DECLARE Number : INTEGER DECLARE Index : INTEGER DECLARE L1 : CHAR DECLARE L2 : CHAR DECLARE Continue : BOOLEAN INPUT Number FOR Index ← 1 TO Number INPUT Word Continue ← TRUE V1 ← 1 V2 ← LENGTH(Word) WHILE Continue = TRUE AND V1 < V2 DO L1 ← SUBSTRING(Word, V1, 1) L2 ← SUBSTRING(Word, V2, 1) IF L1 <> L2 THEN Continue ← FALSE ELSE V1 ← V1 + 1 V2 ← V2 – 1 ENDIF ENDWHILE IF Continue = TRUE THEN OUTPUT "Successful" ELSE OUTPUT "NOT successful" ENDIF NEXT Index
Complete the trace table for the algorithm, using the input data: 2, RACECAR, TREAT
State the purpose of the algorithm on page 6.
Explain how the algorithm knows when all the letters in the word have been checked so that it can stop checking.
The flowchart shows an algorithm that is used to input 50 numbers. Each number is stored in the variable Value when it is input. Any number input that is less than or equal to –20 or greater than or equal to 50 is rejected and re-input. The accepted numbers are added together as they are entered and the total and average of these numbers are output at the end of the algorithm.
Complete the flowchart.
Explain how you would alter the flowchart in 7(a) so that it will individually store each accepted value as it is entered and then output all the numbers, one after the other, outside of the loop that inputs values. You may include program statements or flowchart symbols in your answer, but they must be fully explained.
Draw the symbol for an XOR logic gate and complete the truth table for it. XOR logic gate symbol: Truth table: A B X 0 0 0 1 1 0 1 1
Consider the logic rules in the following table: Input | Binary value | Description A | 0 | operator not present | 1 | operator present B | 0 | ignition key present | 1 | ignition key not present C | 0 | operator code correct | 1 | operator code not correct A crane is a machine with a long arm used to lift heavy objects. The crane will only move: • if the operator is present and • either the ignition key is present, or the operator code is correct. The crane moving is represented by X = 1. Write the logic expression for the crane moving. X = ...............................................................................................................................
Complete the truth table for the crane moving.
A database table, CapitalCity, stores data about capital cities from around the world. Field | Description Identification | a unique identifier Name | the name of the city Country | the name of the country in which the city is located Continent | the name of the continent in which the city is located Population | the number of people living in the city Founded | the year the city was founded AverageIncome | average income of the city’s population, in $, rounded to 2 decimal places Subway | whether or not the city has an underground railway system
Complete the table by writing one appropriate field from CapitalCity for each data type. Each field must be different. Data type | Field Boolean | integer | real | text |
Complete the structured query language (SQL) statement to list only the name, country and population of all the cities in CapitalCity from the continent of Asia. SELECT ..................................................................................................................................... .......................................................... CapitalCity WHERE ............................................................. = .................................................................. ;