1.2.3 Intro to Programming [OUT OF SERVICE]

Question 1

Programming construct: Sequence

Answer 1

Code is executed line-by-line from top to bottom

Question 2

Programming construct: Selection

Answer 2

Certain block of code is run if a specific condition is met, using IF, ELSE IF and ELSE statements

Question 3

Programming construct: Iteration

Answer 3

A block of code is executed a certain number of times or while a condition is met, using FOR, WHILE or DO UNTIL loops

Question 4

What is a variable?

Answer 4

A name used to refer to a particular memory location used to store data.

Question 5

What operator is this: =

Answer 5

Assignment

Question 6

What is the difference between constants and variables?

Answer 6

Value of a constant cannot be edited by the program during execution.

Question 7

What might we use a constant for?

Answer 7

Values that don’t need changing.

EG: VAT, Pi

Question 8

Programming construct: Subroutine

Answer 8

Named blocks of code that perform a specific task.

Question 9

How many values can a function return?

Answer 9

One.

Question 10

What are parameters?

Answer 10

Values passed into a subroutine.

Question 11

Arithmetic operator: **

Answer 11

Exponentiation (raising a number to a power)

Question 12

Arithmetic operator: DIV or //

Answer 12

Integer division

Whole number of times a number goes into another

Question 13

Arithmetic operator: MOD

Answer 13

Remainder when a number is divided by another

Question 14

What are arithmetic and relational operators used for?

Answer 14

Arithmetic: Carrying out mathematical functions
Relational: Making comparison between 2 values

Question 15

Boolean operator: AND

Answer 15

Returns true when both values true

Question 16

Boolean operator: OR

Answer 16

Returns true when at least one value is true

Question 17

How do you get the length of a string?

Answer 17

stringname.length

Question 18

What is a substring?

Answer 18

A section within a string

Question 19

How do you get a substring?

Answer 19

stringname.subString(startPos, numOfChar)

Question 20

How can you open a file to read?

Answer 20

myFile = openRead(“filename.txt”)

Question 21

How can you read a line from a file?

Answer 21

fileContent = myFile.readLine()

Question 22

How can you close a file?

Answer 22

myFile.close()

Question 23

How can you open a file to write?

Answer 23

myFile = openWrite(“filename.txt”)

Question 24

How can you write a line to a file?

Answer 24

myFile.writeLine(“Lovely weather outside”)

Question 25

What is the end of the file given by?

Answer 25

endOfFile()

Question 26

Why is assembly easier to use than machine?

Answer 26

It uses mnemonics.

Question 27

What is each assembly language mnemonic represented by?

Answer 27

A numerical code.

Question 28

Why are assembly language commands processor specific?

Answer 28

They interact directly with the CPU’s registers.

Question 29

What sort of system might assembly language be used in? Why?

Answer 29

Embedded system, due to direct interaction with hardware

Question 30

Mnemonic Function: ADD

Answer 30

Add the value at the given memory address to the

value in the Accumulator

Question 31

Mnemonic Function: SUB

Answer 31

Subtract the value at the given memory address from the value in the Accumulator

Question 32

Mnemonic Function: STA

Answer 32

Store the value in the Accumulator at the given

memory address

Question 33

Mnemonic Function: LDA

Answer 33

Load the value at the given memory address into the

Accumulator

Question 34

Mnemonic Function: INP

Answer 34

Allows the user to input a value which will be held in

the Accumulator

Question 35

Mnemonic Function: OUT

Answer 35

Prints the value currently held in the Accumulator

Question 36

Mnemonic Function: HLT

Answer 36

Stops the program at that line, preventing the rest of

the code from executing.

Question 37

Mnemonic Function: DAT

Answer 37

Creates a flag with a label at which data is stored.

Question 38

Mnemonic Function: BRZ

Answer 38

Branches to a given address if the value in the

Accumulator is zero. This is a conditional branch.

Question 39

Mnemonic Function: BRP

Answer 39

Branches to a given address if the value in the

Accumulator is positive. This is a conditional branch.

Question 40

Mnemonic Function: BRA

Answer 40

Branches to a given address no matter the value in

the Accumulator. This is an unconditional branch.